WeDster ranmy Liorary of Veterinary Medicine
Cummings School of Veterinary Medicine at
Tufts University
200 Westboro Road
North Grafton, MA 01536

I

TUFTS UNIVERSITY LIBRARIES

699 3 9090 013 414 061

U. S. DEPARTMENT OF AGRICULTURE.

FARMERS' BULLETIN No. 170.

PRINCIPLES OF HORSE FEEDING

BY

C. F. LANGWORTHY, Ph. D.

i'BEPARED UNDER THE SUPERVISION OF THE OFFICE OF EXPERIMENT STATIONS.
J^. C. TRUE, Director.

WASHINGTON:

GOVERNMENT PRINTING OFFICE.

1903.

i*V <

.^

LETrER OE TRANSMITTAL

U. S. Department of Agriculture,

Office of Experiment Stations,

Washmgton, D. C, May 1, 1903.
Sir: I have the honor to transmit herewith an article on horse feed-
ing, prepared by C. F. Langworthy, of this Office, and recommend
that it be published as a Farmers' Bulletin. The bulletin discusses
the general principles of feeding, with especial reference to horses,
and summarizes the results of recent experimental work, particularly
that of American experiment stations, the material in its present form
being very largely an abridgment of a more technical publication by
the same author, issued as Bulletin No. 125 of the Office of Experi-
ment Stations, entitled "A Digest of Eecent Experiments on Horse
Feeding."

Respectfully, A. C. True,

Director.
Hon. James Wilson,

Secretary of Agriculture.

2
170

CONTENTS.

rage.

Introduction 5

Principles of nutrition 6

Composition of feeding stuffs 9

Comparative value of feeding stuffs 11

Cereal grains 11

Leguminous seeds 14

Oil cakes and other commercial by-products 14

Forage crops, fresh and cured 16

Roots and tubers 19

Molasses and other by-products of sugar making 20

Fruits, fresh and dried 21

Injurious feeding stuffs 21

Method of feeding 23

Cooked and raw feed 23

Dry and soaked feed 23

Ground and unground feed - 24

Cut and uncut coarse fodder 24

Fattening horses for market 25

Watering horses 25

Digestibility of feeding stuffs _ 27

Comparative digestibility by horses and ruminants 28

Rations actually fed and feeding standards 30

Method of calculating rations 36

Muscular work and its effect on food requirements 37

Measuring muscular work 37

Muscular work in its relation to the ration 38

Proportion of energy of food expended for internal and external muscular

work 40

Energy required to chew and digest food 40

' ' True nutritive value ' ' of feeding stuffs 41

Fixing rations on the basis of internal and external muscular work * 42

Summary 42

170

3

PRINCIPLES OF HORSE FEEDING.

INTRODUCTION.

The scientific study of different problems connected with the feeding
of farm animals has been followed for something over half a century.
Some of the very early work was with horses, but more generally it
was carried on with other domestic animals. Within the last few years
this phase of the problem has received much more attention, and feed-
ing tests, digestion experiments, and more complicated investigations
have accumulated in considerable numbers. The bulk of this work
has been carried on in France and German}^; a creditable amount,
however, has been done in this country, notabl}" by the agricultural
experiment stations, and the results of these experiments and obser-
vations have been published from time to time, and are very useful.
Mention must be made also of the work of practical feeders, which is
of great value.

In the present bulletin the attempt is made to bring together some
of the more important results and deductions which may be gathered
from the American and foreign experimental work, especially that of
recent years. It is not the purpose to provide practical feeders with
directions for feeding according to a particular formula; indeed this
is not necessar}', if it were possible, for practical feeders to a great
extent understand the needs of their horses and how to meet them.
The object is rather to summarize matter which seems interesting and
valuable, and whicli in many cases may give the reason for something
of which the wisdom has long been recognized in practice.

The problem of horse feeding is one which each feeder solves more
or less for himself, the opinion regarding what is and what is not sat-
isfactory feed varying more or less with the time and place. Opinions
may differ as to the value of this food or that, but it is evident that
the actual food requirements of a horse performing a given amount of
work can not vary as a result of a change of opinion on the feeder's
part. With horses, as with all animals, including man, the real prob-
lem is to suppl}^ sufficient nutritive material for building and repairing
the body and furnishing it with the energy necessary for performing
work, whether it be that which goes on inside the body (the beating
170 5

of the heart, respiratory movements, etc.), or the work which is per-
formed outside the body (hauling a load, etc.). The body temperature
must also be maintained at the expense of the fuel ingredients, but
whether material is burned in the body primarily for this purpose, or
whether the necessary heat is a resultant of the internal muscular work,
is not known with certainty.,

The problem of successfully feeding horses differs somewhat from
that encountered in feeding most domestic animals. Cattle, sheep,
and pigs are fed to induce gains in weight, i. e. , to fatten them, or in
the case of milch cows to produce gains in the form of a body secretion
(milk) rather than as fat in the body. In a similar way sheep are fed
for the production of wool, and poultry for the production of eggs.
Sometimes cattle are also fed as beasts of burden. Horses are fed
almost universally as beasts of burden, whether the work consists in
carrying a rider or drawing a load.

Mares with foal require food for the development of their young,
and after birth the colt needs it for the growth and development of
the body as well as for maintenance. Such demands for nutritive
material are common to all classes of animals. Sometimes horses are
fed to increase their weight; that is, to improve their condition. For
instance, animals are often fattened by horse dealers before they are
sold. However, generally speaking, the problem in horse feeding is
to supply sufficient nutritive material for the production of the work
required and at the same time to maintain the body weight. The
almost universal experience of practical horse feeders, and the results
of many carefully planned experiments, agree that there is no surer
test of the fitness of any given ration than that it enables the horse fed
to maintain a constant weight. If the animal loses weight it is evident
that the ration is insufficient, while if gains in weight are made and
the animal becomes fat it is evident that more feed is given than is
necessary. Provided the horse is in good condition, it is seldom desir-
able to induce any considerable gain in weight. Reference is not
made to the small daily fluctuations in weight, but to gains or losses
which extend over a considerable period. The most satisfactory ration
must necessarily bo made up of materials which are wholesome and are
relished by the horse. It should also be reasonable in cost. It must
be abundant enough to meet all body requirements, but not so abun
dant that the horse lays on an undesirable amount of flesh.

PRINCIPLES OF NUTRITION.

The foundation principles of nutrition are the same in the case of all
animals, including man. A brief discussion of the properties of food
and the general laws of nutrition follows.

The study of foods and feeding stuffs has shown tluit although they
differ so much in texture and appearance they are in reality made up

170

of a small number of chemical constituents, namely, protein, fat, car-
bohydrates, and ash, together with a larger or smaller amount of
water. The latter can be often seen, as in the juice of fresh plants.
In dry hay no water or juice is visible. A small amount is, however,
contained in minute particles in the plant tissues.

Protein is a name given to the total group of nitrogenous materials
present. The group is made up mainly of the true proteids and albu-
mens such as the gluten of wheat, and of nitrogenous materials such
as amids, which are believed to have a lower feeding value than the
albumens.

The group "fat" includes the true vegetable fats and oils, like the
oil in cotton seed or corn, as well as vegetable wax, some chlorophyl
(the green coloring matter in leaves, etc.), and other coloring matters;
in l)rief, all the materials which are extracted by ether in the usual
laboratory method of estimating fat. The name "ether extract" is
often and quite properly applied to this group.

The group "carbohydrates" includes starches, sugars, crude fiber,
cellulose, pentosans, and other bodies of a similar chemical structure.
This group is usually subdivided, according to the analytical methods
followed in estimating it, into "nitrogen-free extract" and "crude
fiber;" the former subdivision including principally sugar, starches,
and most of the pentosans, and the latter cellulose, lignin, and other
woody substances which very largel}^ make up the rigid structure of
plants.

The group "mineral matter" includes the inorganic bodies present
in the form of salts in the juices and tissue of the different feeding
stuffs, the principal chemical elements found being sodium, potassium,
calcium, chlorin, fluorin, phosphorus, and sulphur. The term "ash"
is often and very appropriately used for this group, since the mineral
matter represents the incombustible portion which remains when any
given feeding stuff is burned.

The functions of food are (1) to supply material to build and repair
the body, and (2) to yield energy. The chemical composition of a
feeding stuff serves as a basis for judging of its value for building and
repairing body tissue. Its value as a source of energy must, however,
be learned in another way. The most usual way of measuring energy
is in terms of heat, the calorie being taken as a unit. This is the
amount of heat which would raise the temperature of 1 kilogram of
water 1" C. , or 1 pound of water 4^ F. Instead of this the unit of
mechanical energj^, the foot-ton (the force which would lift 1 ton 1
foot), may be used, but it is not as convenient. One calorie corresponds
very nearly to 1.54 foot- tons.

The fuel value of any food is equal to its heat of combustion less
the energy of the excretory products derived from it, and ma}^ be
learned by taking into account the chemical composition of the food

170

8

or feeding stuff, the proportions of the nutrients actually digested and
oxidized in the bod}^, and the proportion of the whole latent energy of
each which becomes active and useful to the body for warmth and
work. However, the fuel value may be and often is calculated from
the composition of the food material supplied, on the assumption that
1 gram of protein furnishes 4.1 calories, 1 gram fat 9.3 calories, and 1
gram carbohydrates 4.1 calories, or 1 pound protein 1,860 calories, 1
pound fat 4,220 calories, and 1 pound carbohydrates 1,860 calories.

The relation between the quantities of nitrogenous and nitrogen-free
nutrients in the ration is called the nutritive or nutrient ratio. In cal-
culating this ratio 1 pound of fat is taken as equivalent to 2.25 pounds
of carboh3^drates — this being approximately the ratio of their fuel
values — so that the nutritive ratio is actually that of the protein to the
carbohydrates plus 2.25 times the fat.

All the organs and tissues of the body contain nitrogen. Protein is
the only nutrient which supplies this element, and is therefore essen-
tial for building and repairing body tissues. The other elements
required, namely, carbon, oxygen, and hydrogen, may be supplied
theoretically by protein, fat, or carbohydrates; but a well-balanced
diet or ration contains all the nutrients in proper proportion. Protein,
fat, and carbohydrates may be burned with the formation of carbon
dioxid and water, and therefore all may serve as sources of energ3^

The mineral matter in food is required for a number of different
purposes, a considerable amount being needed for the formation of
the skeleton. Some is also present in the organs and tissues. It can
not, however, be regarded as a source of energy, according to com-
monly accepted theories, since it can not be burned with the formation
of carbon dioxid and water. The water present in food is not a
nutrient in the sense that it serves for building tissue or yielding
energy, but it is essential, serving to carry the food in the digestive
processes, to dilute the blood, and for many other physiological pur-
poses. The oxygen of the air is required by all living animals for the
combustion, or oxidation, of the fuel constituents of food.

When foods are burned in the body, i. e., oxidized, they give up the
latent energy present in them. In determining the fuel value of pro-
tein, due allowance is made for the fact that combustion is not as com-
plete in the body as in a furnace.

The body is often likened to a machine, but it differs from one in a
number of important ways; for instance, it is itself built up of the
same materials which it utilizes as fuel, and further, if an excess of
fuel, i. e., food, is supplied, it may be stored as a reserve material for
future use, generally in the form of fat or glycogen, a sugar-like body.

The amount of work performed by a horse, for convenience in meas-
urement, may bo resolved into several factors, as follows: (1) The
energy expended in chewing, swallowing, and digesting food, keeping

170

9

up the beating of the heart, circulation of the blood, respiratory move-
ments, and other vital processes; (2) the energy which is expended in
moving the body, walking', trotting, etc., which is usually spoken of
as energy required for forward progression; and (3) the energy which
is expended in carrying a rider, as in the case of a saddle horse, or
drawing a load, as in the case of a draft animal or carriage horse.

The character of the road, whether level or up or down hill, is an
important factor in determining the amount of work. It is evident
that more energy is required to lift the body at each step and move it
forward when climbing an incline than when walking on a level. In
the same way, when a load is drawn uphill it must be raised as well as
drawn forward.

Work may be measured as foot-pounds or foot-tons, or by any other
convenient unit. A foot-j)ound is the amount of energy expended in
raising 1 pound 1 foot; a foot-ton, that expended in raising 1 ton 1
foot; a commonly used unit of force is the "ton power," equivalent
to 550 foot-pounds per second. Work may also be measured in terms
of heat, i, e., calories. This is especially convenient in discussing
problems of nutrition, since the heat of combustion is one of the factors
usually determined or calculated when foods are analyzed; and further-
more, the feeding standards which have been proposed for horses and
other farm animals show the requirements per day in terms of nutri-
ents and energy. One calorie corresponds, as stated above, very
nearly to 1.54 foot-tons.

COMPOSITION OF FEEDING STUFFS.

The feeding stuffs of most importance for horses are cereal grains,
such as oats and corn, either ground or unground; leguminous seeds,
as beans and peas; cakes, and other commercial by-products, as oil-
cake, gluten feed, and so on; fodder crops, green or cured; and differ-
ent roots, tubers, and green vegetables. In quite recent times cane
molasses, beet molasses, and other beet-sugar by-products have
assumed more or less importance in this connection. The composition
of a number of these different feeding stuffs ma}^ be seen by reference
to Table 1, which shows the average composition as determined by
anal3"sis, and when possible the digestible nutrients furnished by each
100 pounds of the feeding stuffs, the latter data having been calculated
])y the aid of figures obtained in digestion experiments with horses.
In a number of cases such calculations have not been made, for the
reason that experiments showing the digestibility of the feeding stuffs
have not been found, nor were results of experiments made with
similar feeding stuffs available. The comparatively large number of
feeding stuffs of which the digestibilit}^ has not been determined indi-
cates one of the lines of work which might be profitably followed.

170

10

Table 1. — Average composition of a number of feeding stuffs.

Percentage composition.

Digestible materials in
100 pounds.

Kind of food .
material.

Water.

Pro-
tein,

Fat.

Nitro-
gen-
free
ex-
tract.

Crude
fiber.

Asix.

Pro-
tein.

Fat.

Nitro-
gen-
free
ex-
tract.

Crude
fiber.

lbs. di-
gesti-
ble

nutri-
ents.

GREEK FODDEE.

Per ct.
79.3
66.2
76.1
73.0
76.6
62.2
77.3
73.0
69.9
61.6
65.1
70.8
74.8
71.8

Per ct,
1.8
2.1
.5
2.3
2.6
3.4
2.3
2.6
2.4
3.1
4.1
4.4
3.9
4.8
2.4
4.0

2.2

.8

4.2

2.7

4.5
6.0
2.5
1.9
3.8

4.8
9.3
7.4
6.0
7.9
8.1
5.9
7.8
7.5
7.0
7.5
7.4
11.6

10.1
12.3
12.8
15.7
14.3
16.6
3.4
3.0
4.0
5.2

2.1
1.1

10.3
10.5
10.5

Perct.

0.5

1.1

.5

.7

.6

1.4

.7

.9

.8

1.2

1.3

1.1

.9

1.0

.4

1.0

1.1

.3

1.2

1.5

1.6

1.4

.7

.5

1.1

1.6
2.5
2.7
1.8
1.9
2.6
2.5
3.9
2.1
2.7
1.7
2.5
3.1

2.6
i.o
2.9
2.9
2.2
2.9
1.3
1.2
2.3
1.3

.1
.4

5.0
5.0
5.4

Perct.
12.2
19.0
14.9
15.1

6.8
19.3
12.0
13.3
14.3
20.2
17.6
13.5
11.0
12.3

7.1
10.6

15.0
15.3
11.6
7.6

U.7
35.7
28.3
17.0
31.5

39.6
48.7
40.6
55.3
47.5
41.0
45.0
37.8
49.0
38.4
44.9
42.1
89.4

41.3
38.1
40.7
39.3
42.7
42.2
43.4
46.6
42.4
35.1

17.3
7.6

70.4
70.1
09.0

Per ct.
5.0
8.7
7.3
6.9
11.6
11.2
5.9
8.2
10.8
11.8
9.1
8.1
7.4
7.4
4.8
6.7

5.8
6.4
8.4
o.O

14.3
21.4
15.8
11.0
19.7

26.8
23.6
27.2
22.5
28.6
32.4
29; 0
23.0
27.7
25.0
30.5
27.2
22.5

27.6
24.8
25.6
24.1
25.0
20.1
38.1
38.9
37.0
43.0

.6
1.3

2.2
1.7
2.1

Per ct.
1.2
2.9

2!o
1.8
2.5
1.8
2.0
1.8
2.1
2.8
2.1
2.0
2.7
1.7
2.6

1.5
1.1
2.6
2.9

2.7
5.5
1.8
1.2
3.4

8.0
5.3
6.1
5.6
5.2
6.0
4.4
6.3
CO
6.9
0.9
5.5
6.8

5.5
0.2
8.3
8.3
7.4
7.5
4.2
3.2
5.1
5.5

1.0
1.0

1.5
1.4
1.5

Us.

Us.

Us.

Oiio-
Us. ries.

Ck)m leaves and busts
Cornstiilks stripped ..

Orchard grass

Kentucky blue grass .
Red clover

....:

3.44
3.05
3.75

10.94
8.91
9.%

3.79
3.46
3.46

33,796

Alsike clovera

Alfalfa

28,681
31,936

oowpea

83.6
75 1

SILAGE.

74.4
76.1
72.0
79.3

42.2
30.0
50.9
68.4
40.5

19.2

10.6

16.0

8.8

8.9

9.9

13.2

21.2

7.7

20.0

8.5

15.3

16.6

12.9
15.3
9.7
9.7
8.4
10.7
9.6
7.1
9.2
9.9

78.9
88.6

10.6
11.3

1

!

Sorghum silage

Red -clover silage

Cowpea-vine silage...

HAT AOT) DRY COARSE
FODDER.

Com fodder, field

Comleaves.fleldcured

1

Kaflr-com stover, field

■"■ I i" ■■

I j

1

.

Redtop

4.51
4.62
1.25
4.45
4.28
4.00
4.28
4.23
6.62

5.77
0.85
7.13
8.74
10.67

0.39
.54

1.18
.81
.43
.56
.35
.52
.61

.54
.95
.83
.83
.42

26.93
23.25
21.29
21.43
27.78
21.77
25.51
23.87
22.34

23.42
24. 19
25.^4
24.96
29.98

11.35
12.86
12. a5

9.13
11.00
10.23
12.11
10.80

8.93

10.96
9.27
9.57
9.01
9.75

81,2^

Orchard grass b

Timothv

78,036
69, 873

Kentucky blue gra.<s<>.

Hungarian grass b

Meadow fescue b

Italian rye grass b

Mixed grasses 6

Rowen (mixed) b

Mixed grasses and

08,536
81,905
69, 415
79, 410
74, 554
73, 175

76, 957

Redclover

Alsi ke cloverc

White clover c

\italfa

78,984
82,630
82,942
95,520

.83
1.11

.85

.79

1.51

12.20
13.10
11.91

6.74
6.S9
6.55

40,544

Rve straw d

42,020

42,770

ROOTS AXD TCBEES.

Potatoes

i.a5

1.09

5.95
6.07

C.07

2.39
2.39
2.58

17.20
7.13

62.09
61.83
61.39

.05

35,526

Carrots

15,290

GRAINS AND OTHER
SEEDS.

Corn dent

136,636

Com, flint

136,376

Com, all varietiw

10.9

136,363

170

1 Digestibility calculated from values obtained with green alfalfa.
''Digestibility calculated from values obtained with meadow hay.
<• Digestibility calculated from valui- obtained with red-clover hay.
d Digestibility calculated from valn« s ibluineil with wheat straw.

11

Table 1. — Average composition of a number of feeding stuffs — Continued.

Percentage composition.

Digestible materials in
100 pounds.

En-
ergy
in 100
lbs. di-
gesti-
ble
nutri-
ents.

Kind of food
material.

Water.

Pro-
tein.

Fat.

Nitro-
gen-
free
ex-
tract.

Crude
fiber.

Ash.

Pro-
tein.

Fat.

Nitro-
gen-
free
ex-
tract.

Crude
fiber.

GRAINS AND OTHEB

.SEEDS — continued.

Perct.
12.5
14.8
10.9
11.0
11.6
10.5
9.1
11.9

15.0
11.7
15.1
11.9
10.5

11.9

10.7

8.7

8.6

7.8

7.7

75.7

8.0

11.8

11.9

12.1

11.8

8.2

11.1

9.2

9.9
25.7
25.1

Perct.
10.9
10.6
12.4
11.8
10.6
11.9
19.6
2:3.5

9.2
11.0

8.5
10.5
20.2

9.6

2.4

9.8
30.0
23.4
16.0

5.4
24.1
14.7
15.4
15.6
14.9
42.3

4.2

32.9

35.9
a7.3
a2.4

Perct.
2.9
2.6
1.8
5.0
1.7
2.1
20.1
1.7

3.8
3.9
3.5
2.2
1.2

4.4

.5
6.2
8.8
8.3
7.1
1.6
6.7
2.8
4.0
4.0
4.5
13.1
2.2

7.9

3.0

Perct.
70.5
58.8
69.8
59.7
72.5
71.9
28.3
5.5.7

68.9
52.3
64.8
66.3
51.1

7:

54.9
62.6
49.2
53.2
59.4
12.5
44.8
63.9
53.9
60.4
56.8
23.6
33.4

35.4

36.8
658.2
669.3

Perct.
1.9
8.7
2.7
9.5
1.7
1.^
18.9
3.8

1.9

18.0

6.6

6.5

14.4

.9

30.1

11.2
2.6
6.2
6.1
3.8

13.0
3.3
9.0
4.6
7.4
5.6

46.3

8.9
8.8

Perct.
1.3
4.5
2.4
3.0
1.9
1.8
4.0
3.4

1.4
3.1
1.5
2.6
2.6

2.2

1.4
1.5
.8
1.1
3.7
1.0
3.4
3.5
5.8
3.3
4.6
7.2
2.8

5.7

5.6
8.8
3.2

Ug.

Us.

Lbs.

Lbs.

Calo-
ries.

Barlev

Oats.

9.39
8.51

3.60
.72

45.25
63.29

2.82 122,062
1.70 139,747

Rve

Wheat

MILL PEODUCTS.

6.99
9.06

2.55
3.12

64.70
4.5.03

.38 144.454

2.59 118,7-27

Corn-anrt-cob meal

1 i":".'"': 1 ;

1 1 '•

Ground com and oats
(equal parts).

BY PEODCCTS.

Corncob

i

Gluten meal

i

Gluten feed

1 ;

Uatfeed

1 1

lirewers" grains, wet. .

1

Brewers' grains, dried.

..: :J... . 1

i i

1 !

Wheat middlings

1

i 1

1 1 1

Cotton-seed hulls

Linseed meal, new
process

Beet-sugar molasses . .
Cane-sugar molasses. .

7.3
3.2

58.2
69.3

::.::::

259,182
298,398

"Largely nonalbuminoid nitrogenous materials,
t Verv largelv sugars.

COMPARATIVE VALTJE OF FEEDING STUFFS.

CEREAL GRAINS.

It will be seen that the cereal grains resemljle one another quite
closely in compcsition, being characterized by fairly low water con-
tent and a considerable amount of protein and nitrogen-free exti"act.
Some crude fiber, derived from the outer or bran layer of the grain, is
also present. The superiorit}' of one grain over another, if it exists
at all, must therefore depend, in large measure, on some factor other
than composition. It has been urged by many that oats possess a
peculiar stimulating body called '"avenin." and are on this account
superior to other grains for horses. Oats undoubtedly possess a
flavor or some such characteristic which makes them a favorite food
with horses, but the most careful chemical study has failed to reveal

170

12

any substance of the nature of the theoretical avenin. Recent experi-
ments have shown that the fat of oats and oat straw is more thoroughly
digested than that of other cereals. This is suggested as a possible
explanation of the superior feeding value of oats.

It is believed by many that horses show more spirit when oats form
part of the ration. Discussing this subject, Director W. A. Henrj^, of
the Wisconsin Experiment Station, says:

Horses nurtured on oats show mettle which can not be reached by the use of any
other feeding stuff. Then, too, there is no grain so safe for horse feeding, the animal
rarely being seriously injured if by accident or otherwise the groom deals out
an oversupply. This safety is due in no small measure to the presence of the oat
hull, which causes a given weight of grain to possess considerable volume, because
of which there is less liability of mistake in measuring out the ration; further,
the digestive tract can not hold a quantity of oat grains sufficient to produce serious
disorders. Unless the horse is hard pressed for time or has poor teeth oats should
be fed in the whole condition. Musty oats should be avoided.

Horsemen generally agree that new oats should not be used, though Boussingault,
conducting extensive experiments with army horses, arrived at the conclusion that
new oats do not possess the injurious qualities attributed to them.

The grain most commonly substituted for oats in this country is
Indian corn or maize. It is so commonly used, especiall}^ in the
South and West, that it is difficult to realize the prejudice which has
existed against it in other countries. It has been asserted that there
are climatic and other conditions which render corn a suitable horse
feed in America which do not exist elsewhere. This hardl}'^ seems
reasonable, and has not been borne out by the numerous experi-
ments undertaken in France, Germany, and other counti'ies. Such
experiments have demonstrated the value of corn and shown the truth
of the opinions generally held in this countr}^ namel}^, that it is a safe
and satisfactory feeding stuff for horses.

Barley, rye, and wheat are sometimes fed to horses. Their resem-
blance to oats in composition will be seen b}^ reference to the table.
All these grains should be substituted on the basis of chemical com-
position, and not pound for pound. As would be expected, the ground
grains differ little from the same varieties before grinding.

Bran, shorts, middlings, and other b3'-products vary in composition,
but all have a low water content, while the crude fiber content is
generally rather high. Their nutritive ingredients are principally
protein and carboh3^drates. The high crude fiber content is due to
the fact that these products represent the outer layers of the grain,
which are more hard and firm in structure than the interior portion,
which consists quite largely of starch.

The total number of tests to compare different feeding stuffs for
horses which have been undertaken by the agricultural experiment
stations in the United States is not large compared with the tests
made with other farm animals. The results obtained are, however,
interesting.

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13

The problem most often investigated has been the possibility of sub-
stituting other grains for oats wholly or in part in the ration of work
horses without lowering their efficiency. In this connection the Maine
Station studied the value of pea meal and middlings fed in the ratio of
1 part of the former to 2 parts of the latter and of mixed grains as com-
pared with oats. The Utah Station compared corn and bran and shorts
with oats; the North Dakota Station, bran and shorts, barley and bran,
and mixed grains. As a whole these and similar tests offered practical
demonstrations of the fact that oats could be replaced by other grains
when circumstances warranted it.

At the New Hampshire Station the value of different grain mixtures
for horses was studied with a view to learning how the cost of a ration
could be diminished by lessening the amount of oats fed. The rations
consisted of different mixtures of oats, bran, corn, gluten feed, linseed
meal, and cotton-seed meal. Fairly good results were obtained with
all the mixtures, that containing cottou-seed meal being least satisfac-
tory, as it was not at first relished by the horses. The conclusion was
reached that any mixed ration furnishing the desired nutrients at a
reasonable price should be considered. A mixture of bran and corn
1:1 was regarded as a good substitute for corn and oats for work
horses.

Tests carried on at the Utah Station have demonstrated the value of
wheat for horses, a grain which sometimes has so low a market value
that it may be profitably fed.

The North Dakota Station has carried on a number of tests with
barley which furnish experimental evidence that this grain is a useful
feed. When taxed to the limit by hard work it was found, in the
experiments referred to, that the horses could not be supported upon
barley quite as well as upon oats, and that it was worth slightly less per
pound than oats with animals performing a medium amount of work.
Mules did not take as kindl}^ to barley as horses, and dainty horses
would not eat it quite as readily as oats. On the Pacific coast barley
is extensivel}' grown as a horse feed, and its use for this purpose is old
in other countries. Elsewhere barley is not extensively"used as a feed
in the United States, doubtless owing to the fact that it is in such
demand for brewing purposes that it is usually high in price.
Wherever it is grown, however, it is frequently possible to secure at
a low cost grain which is off color owing to rain or fog during harvest,
and which, for this or some other reason, is unfit for brewing, but
valuable as feed.

Barley may be fed whole to horses having good teeth and not required
to do severe work. Since ground barlej^, like wheat, forms a pasty
mass when mixed with saliva, it is regarded as more satisfactor}^ to
crush than to grind it, if for any reason it is considered undesirable to
feed the grain whole.

170

A test at the North Dakota Station with malted barley indicated that
this is not an economical feed for work horses.

Kafir corn is a grain which is assuming more and more importance
in the semiarid regions of the United States and is replacing corn in
many ways. The Oklahoma Station has tested its value as a horse
feed and regards it as healthful, palatable, and nutritious with a
feeding value somewhat less than corn. The grain is very flinty and
to secure the best results should be ground. According to informa-
tion recently received from the station Kafir corn is highly esteemed
locally as a feed for horses, many being kept throughout the jeav on
this grain and prairie hay. Unthrashed heads are commonly fed, a
head of Kafir corn being regarded as equivalent to an ear of corn.
Some years ago the Mississippi Station in tests with mules found that
chicken corn, a variety closely allied to Kafir corn, had about the same
feeding value as maize.

LEGUMINOUS SEEDS.

Beans and other leguminous seed resemble the cereal grains in hav-
ing a low water content. In Europe horse beans are a common feeding
stuff for horses. Though such feeds are known to be useful and valu-
able, they are seldom given to horses in the United States and few if
any tests have been made with them at the American experiment sta-
tions. Miintz found that beans were quite thoroughly digested even
when fed in such large quantities as 14 pounds per day. According
to an English authority this amount would prove harmful, and 5 pounds
of beans per day or a slightly larger quantity of peas is considered all
it is desirable to feed.

OIL CAKES AND OTHER COMMERCIAL BY-PRODUCTS.

The various cakes, gluten materials, and similar feeding stuffs are,
generally speaking, commercial by-products. Thus, cotton-seed cake
is the material left after the oil has been expressed from the cotton
seed. In the same way, linseed cake is the residue obtained in the
manufacture of linseed oil. If this cake is ground it becomes linseed
meal. In the manufacture of beer the malted grain is known as brew-
ers' grain and is best fed after drying. When starch is manufactured
from corn, the nitrogenous portion of the grain is rejected and consti-
tutes gluten feed and gluten meal. The cereal breakfast food com-
panies have placed many feeding stuffs upon the market made up of
various by-products obtained in the manufacture of their breakfast
foods and similar products. These feeding stuffs vary in value, but
may generall}^ be said to represent the branny portion of the grains
from which they are derived.

Several j^ears ago the New Jersey Station reported an extended
study of the value of dried brewers' grains replacing an equal weight

170

15

of oats in the ration of work horses. The uniformity in the amount
of feed consumed and the weight of the animals, taken in connection
with the work performed, indicates that there was no material differ-
ence in the value of the oat ration and that containing dried brewers'
grains.

Timothy hay at the time being worth 118, wheat bran $17.50, corn
meal $22, dried brewers' grain $17, and linseed meal $29 per ton, it
was calculated a farm horse weighing 1,000 pounds can be fed for
$30.84 during the six months of the year when the most work is
performed if dried brewers' grain furnishes the bulk of the neces-
sary protein, and for $33.49 if wheat bran and linseed meal are the
chief sources of this nutrient. If the fertilizing value of the feeding
stuffs is taken into account the difference in favor of the brewers'
grains is less marked.

According to W. J. Kennedy, of the Iowa Station, gluten feed has
been fed with excellent results by many prominent feeders, and is
especially valuable in fitting horses for market. A ration composed
of 2 parts gluten feed, 1 part bran, and 1 part soaked shelled corn was
recommended. This is rich in protein and is suited to the needs of a
hard-working animal. It is stated that the amount of the above mix-
ture required averages from 12 to 14 pounds per day for a horse weigh-
ing 1,400 pounds, or in general, a pound per 100 pounds live weight.

Cotton-seed meal has been fed to a greater or less extent to horses,
especially in the South, with varying results; though on the whole the
weight of evidence seems to be in its favor, the North Carolina Station,
for instance, finding that 2 pounds per head could be satisfactorily
given as part of a mixed ration. The New Hampshire Station, as
noted above, did not find cotton-seed meal as satisfactory as other
materials in a mixed grain ration.

At the Louisiana Station this feed has given satisfactory results
with horses and mules, 1 to 2 pounds per mule per day being fed
with success. Six pounds is regarded as the maximum quantity
which it is desirable to feed and animals should be led up to this
amount gradually. Only bright yellow cotton-seed meal of a nutty,
pleasant odor and taste should be used and no reddish or musty meal
should ever be fed. As cotton-seed meal is a very concentrated feed
excessive quantities should be avoided. Care should be taken that
uneaten residues do not ferment in the feed boxes.

The cereal grains, ground and unground, commercial by-products,
leguminous seeds, oil cakes, and similar products are very frequently
called concentrated feeds, the name being suggested by the fact that,
generally speaking, the food value, especially the protein content, is
high in comparison with the bulk. So far as the general experience
and the results of American and foreign feeding experiments go, most

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16

of the common feeding stuffs in the group are wholesome and valuable
for horses. If any one of these feeding stuffs is substituted for oats,
which may be taken for a standard, the substitution should be propor-
tional to the composition of the two feeds and not pound for pound.

FORAGE CROPS, FRESH AND CURED.

The various forage crops — grass, clover, Kafir corn, corn, etc. — all
have a high water content; that is, they are more or less succulent
and juicy. They contain, however, considerable nutritive material,
usually protein and carbohydrates, and are valuable feeding stuffs.

The leguminous forage crops— alfalfa, clover, cowpeas, soy beans,
vetch, etc. — are richer in protein than the grasses. When the forage
crops are dried and cured the resulting hay is richer in proportion to
its bulk than the green material; in other words, it has been concen-
trated by the evaporation of the greater part of the water present.
However, this is not the only change which has taken place. When
hay is properly cured it undergoes a peculiar sort of fermention or
oxidation which materially affects its composition.

As shown by recent investigations, fermentation improves the hay
by diminishing the quantity of crude fiber and by increasing the rela-
tive amount of other nutrients, especially nitrogen-free extract. The
greater the fermentation the more the crude fiber is diminished, and
this is especially marked when ha}^ is dried on racks. Hay which has
undergone proper fermentation has a better flavor and agrees better
with animals and is apparently more digestible than hay which has
dried quickly in the sun without fermentation.

The feeding value of different forage crops, fresh and cured, depends
in considerable degree upon the stage of growth, as has been shown
by a number of chemical studies of the composition of different crops
and cuttings of alfalfa, young and more matured corn forage, etc.
Generally speaking, the nutritive value of the crop increases until
growth is complete and diminishes somewhat as the plants mature or
become overripe. Straw, the fully ripened stalk of cereal grains,
contains some nutritive material, but is less nutritious than the same
portion of the plant cut before ripening. In the perfectly ripe con-
dition the nutritive material, elaborated in different portions of the
ordinary forage plants, has been largely conveyed to the seed and used
for its development or stored as reserve material.

Green forage crops are frequently preserved by ensiling. In this
process the material undergoes a peculiar oxidation which correspond-
ingly changes it in composition and food value. Some of the carbo-
hydrates are changed into alcohol, acetic and other acids, and crude
fiber is undoubtedly softened somewhat, and possibly the silage is thus
rendered more digestible. Bodies having peculiar flavor and odor are
also formed.

170

The green crops, hay, straw, other cured crops, and silage are fre-
quently called "coarse fodder" or "roughage." This term is due to
the fact that they contain a comparatively small amount of nutritive
material and a high proportion of crude fiber as compared with their
total bulk. Although inferior to concentrated feeds in composition,
they are an essential part of the ration of horses and other farm ani-
mals, serving to give the required bulk to the food and being useful
in other ways.

It is believed that unless the food, when taken into the stomach, is
comparatively bulky and the mass is more or less loose in structure,
it is not readily acted on by the digestive juices. The intestinal tract
of the horse is long in proportion to the size of the animal, and food
remains in it for several days. Experiments indicate that crude fiber,
which is only slightly digestible by man, is quite thoroughly digested
by horses, and even more thoroughly digested by ruminants, owing its
digestibility to the fact that it is fermented for a comparatively long
period by micro-organisms in the intestines.

A number of experiments have been made to learn the comparative
value for horses of different forage crops, fresh and cured, the Ameri-
can experiment stations naturally having given their attention to the
coarse fodders of most importance in this country.

The Virginia Station reported a number of trials on the value of
corn silage for horses and mules. Gradually increasing amounts were
fed until they were given all they could eat, with hay and grain in
addition. The tests indicated that silage is a satisfactory feed pro-
vided the animals are gradually accustomed to it. The New Hamp-
shire Station, in connection with a study of the value of different grain
mixtures for work horses, compared the relative merits of timothy hay
and corn stover, the two sorts of fodder being found equally valuable
under the experimental conditions. From the work of the Oklahoma
Station, Kafir-corn- stover is said to have a feeding value about equal
to corn stover. Running the stalks through a thrashing machine is
considered a satisfactory method of preparing this feeding stuff.

The value of oat straw, prairie hay, and brome grass was shown
by the work of the North Dakota Station, the brome grass giving as
good results when fed to work horses as timothy hay. When Ber-
muda grass hay and timothy hay were compared at the Mississippi
Station no marked differences in the cost of the rations nor in the gains
made by mules were observed.

The results of extended series of experiments at the Utah Station
have been very favorable to the use of alfalfa hay as a coarse fodder
for horses. The fact is recognized that, like other leguminous crops,
it contains a larger amount of protein in proportion to its bulk than
timothy. Feeding alfalfa did not exercise any bad effects on the health
25352— No. 170—03 2

170

18

of the horses. It is stated that attacks of colic and other digestive
disorders can be prevented by a judicious system of feeding. In dis-
cussing their investigations the station points out that it is absurd to
claim that a horse will not eat more than is necessary if allowed the
libert}'- of the stack and the grain bin. The argument is sometimes
advanced that a horse under natural conditions, on pasture, never eats
more than is necessary, and that under these conditions he is never
subject to digestive disorders. While this is undoubtedly true, it must
be kept in mind that as soon as the horse is stabled and required to
work, he has been taken away from his natural condition and placed
in an unnatural evironment.

It was observed that larger amounts of water were consumed on the
alfalfa ration and that the amount of urine excreted was also larger
and had a higher specific gravity. The excess, however, was never
found great enough to cause any inconvenience. These experiments
at the Utah Station are especially interesting since they confirm the
results of twelve years' practical tests of the feeding value of alfalfa.
During this period the station horses have always received this mate-
rial as a coarse fodder, except when they were fed other rations for
experimental purposes.

The Wyoming Station has also made some experiments which dem-
onstrate the value of alfalfa hay as a horse feed. In discussing the
subject of alfalfa for horses, the California Station says in effect that
in regions where it is a staple crop the quantity of protein which can
be supplied in green and cured alfalfa is so great that much less grain
is required than when the coarse fodder consists of cereal ha^^s only.
For the Pacific coast, where cereal hays replace so largely those from
meadow grasses, the station recommends a ration of alfalfa hay with
wheat hay or barley hay and grain.

In a recent discussion of horse feeding under local conditions the
Louisiana Station has pointed out the value of cowpea-vine hay.

The outcome of the different experiments is in accord with the obser-
vation of careful feeders, viz, that the various common coarse fodders
may be fed to horses as circumstances demand. Although timothy
hay is in many regions regarded as the preferable coarse feed, yet
experience has shown that corn fodder, hay from wheat, barley, and
other cereal grains, and from clover and alfalfa may be substituted
for it. That this is what might be expected is shown b}^ a study of
the composition of these feeding stuffs. They resemble one another
very closely in the character and amount of nutrients which they con-
tain— alfalfa, clover, and other leguminous hays being richer in pro-
tein than the cured grasses and cereal forage. Straw is not much fed
to horses in the United States, but is a common feeding stuff in Europe.
As shown by its composition and digestibilit}^ it compares quite favor-

170

19

ably with other coarse fodders. In accordance with the general prin-
ciple the substitution of one coarse fodder for another in a ration
should always be made on the basis of composition and digestibility,
rather than pound for pound.

Very few tests have been made on the comparative value of different
uncured feeds or different sorts of pasturage in horse feeding, though
all the common forage crops are regarded as wholesome if properly
fed.

Such feed is known to be very dependent upon the fertilizer used
for the crop, the method of harvesting, and the condition of the animal
fed. Thus it is said that for young horses grass grown on dry land
rich in lime produces compact and well-developed bone. Green fodder
does not contain sufficient nutritive material in proportion to its bulk
to make it an adequate feeding stuff for horses performing much work,
but its importance as pasturage is well recognized.

ROOTS AND TUBERS.

Carrots, Swedish turnips or ruta-bagas, and other roots and tubers,
green vegetables, and fruits contain a high percentage of water and
small amounts of the different classes of nutrients. Generally speak-
ing, the percentage of crude fiber is smaller than in the green forage
crops; but since the proportion of nutritive material is small in com-
parison with the total bulk, they are ordinarily referred to as coarse
fodder. The use of these materials as food for horses has been
attempted at different times with varying success, but it is not followed
to any great extent in this country, though quite common in Europe.

Ten pounds of roots has been suggested as the maximum quantity
which may be fed without unduly distending the stomach or being too
laxative. "An addition of 5 or G pounds of carrots to the daily food
ration of ordinary working horses," Captain M. H. Hayes believes,
"will almost always be of benefit; and 3 pounds a day will not be too
much for race horses, even in the highest state of training. It is safest
to give carrots sliced longitudinally, so that they may not stick in the
animal's gullet and thus choke him."

In the opinion of a recent German writer, about 12 pounds of raw
potatoes per 1,000 pounds live weight may be fed to horses with
advantage and, if supplemented with proper feed, there need bo no
fear of physiological disturbances. When fed in this amount the
potatoes should be mixed with hay or cut straw to insure their being
properly chewed. If small, they may be fed whole; if large, they
should be sliced. In any case only ripe, healthy, unsprouted tubers
should be used. It is said that horses should not be watered immedi-
ately after a ration containing potatoes.

170

MOLASSES AND OTHER BY-PRODUCTS OF SUGAR MAKING.

The beet chips, diffusion residue, and other by-products obtained in
the manufacture of beet sugar, consist of the sugar beet from which a
considerable portion of the carbohydrates has been removed. The
total amount of nutritive material present, however, is fairl}^ large.
These products, properly speaking, are coarse fodders. Molasses,
which consists almost entirely of carbohydrates (sugars), was used as
early as 1830 as a feed for horses, and, has recently attracted consid-
erable attention in this connection. When used for this purpose
it is usually sprinkled on dry feed, being first diluted with water, or it
is mixed with some material which absorbs it and renders it easy to
handle, such as peat dust, or with some material rich in nitrogen, as
dried blood. In the latter case the mixture more nearly represents a
concentrated feed than the molasses alone, or molasses mixed with an
absorbent material only. Cane-sugar molasses is also used as a feed-
ing stuff. It differs from beet molasses, in that it contains glucose in
addition to cane sugar, and has a much smaller percentage of salts.

The number of experiments which have been reported in the last
few years on the feeding value of molasses is fairly large. Accord-
ing to the Louisiana Station, cane-sugar molasses has been extensively
used for some time locally as a feed for horses and mules, many feed-
ers keeping mules exclusively on rice bran and molasses in addition to
cowpea hay. The general custom is to feed the molasses from a large
trough, allowing the mules to eat it ad libitum. It is said the}^ will
consume, with apparent relish, from 8 to 12 pounds per head daily.
The mules at the Louisiana Station have been fed molasses daily ad
libitum for eight or ten years, and, it is stated, show its good effects
"in their splendid condition, lively action, and endurance of work."

When molasses, diluted with water and sprinkled over chopped hay,
was fed to some army horses in Porto Rico' for about five months the
condition of the horses improved. Apparently, a daily ration of 35
pounds of grass and 13 to 15 pounds of molasses per 1,000 pounds live
weight was sufficient to maintain a horse in good condition. It was
noted that molasses possessed some disadvantages, namel}^ it attracted
insects, notably flies and ants, stuck to the animaPs coat, smearing his
face and breast, halter and halter strap, etc. , and caused some trouble
and delay in mixing it with the other feeds.

Other tests in the United States, France, Holland, and elsewhere
have been favorable to the use of molasses as a feeding stuff, and from
the results of all these, it seems fair to conclude that it can be
safel}^ fed to horses when its cost in comparison with other feeding
stuffs warrants its use, a quart night and morning, diluted with water,
being apparently a reasonable amount. Apart from the nutritive
material molasses supplies it has a value as an appetizer and frequently
renders poor hay or other feed more palatable.

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21

In Europe favorable results have attended the use of such mixtures
as blood-molasses, but these feeds are as yet little known in the United
States.

FRUITS, FRESH AND DRIED

Althoug-h horses are often given apples as they are given lumps of
sugar, fruit is not generally thought of as a feeding stuff, yet its use
for this purpose is by no means novel. The Arabs, it is said, com-
monlv feed their horses fresh dates, which are apparently eaten with
relisb. Sometimes the dates (3 or 4 pounds at a time) are mixed with
water to a sort of mush before feeding. It is believed that dates are
fattening, but that they do not produce muscle.

In California, and possibly in other regions, fruit, especially prunes
and other dried fruit, is sometimes fed when the market is overstocked
or when for some other reason it can not be profitably sold. Accord-
ing to a statement recently published, small prunes of low market
value have been successfully fed to horses for a long period. It is
stated that the horses eat them with relish. The pits should be
crushed before feeding.

All common fruits when fresh are very succulent, containing on an
average 80 to 90 per cent water, the nutritive material consisting
almost entirely of carboh^^drates. When dried — i. e., concentrated
by evaporation — they are much more nutritious. Raisins, prunes,
dried" peaches, etc., contain about 25 per cent water and about TO per
cent carbohydrates, of which a considerable part is sugar. The value
of sugar as a nutrient is recognized, and it is not surprising, therefore,
that fruits, especially after drying, should have a considerable feed-
ing value. The feeding value of fruit has been especially studied at
the California Station.

Succulent fruits or vegetables are little used in the United States,
but it is interesting to note that in South Africa pumpkins are often
given to horses as green feed. In Oklahoma and doubtless other regions
where they are grown extensively, stock melons are fed to all farm
stock, including horses, when there is a shortage of other succulent
crops.

INJURIOUS FEEDING STUFFS.

In feeding horses precautions should always be taken to avoid mate-
rials harmful in themselves, or those which have become harmful.
Dirt, small stones, etc., should be removed from grain by proper
screening, and all feeding stuffs should be clean.

There are a number of plants which' are poisonous to horses when
eaten in any considerable amount. The loco plants, mostly species of
Astragalus, are ordinarily regarded as of this class. These plants have
been studied by the Colorado, Kansas, South Dakota, Montana, and
Oklahoma stations among others, and by this Department, but the

170

22

results obtained are not entirely conclusive. The poisonous properties
of rattlebox {Crotalaria sagittaUs) were demonstrated by the South
Dakota Station, and those of some lupines by the Montana Station.
According to recent experiments at the Vermont Station the common
horsetail {Equisetwn arvense) may cause poisoning when present in hay.
It was found that when horses were fed cured horsetail equal in amount
to not more than one-fourth of their coarse fodder ration, symptoms
of poisoning were noticed, and if the feeding was continued the horses
died. The symptoms of poisoning were less noticeable with young
than with old horses, and also when a liberal grain ration was supplied.
It was also observed that the green plant was less harmful than the
dry, possibly owing to the fact that green fodder is somewhat laxative.

Feeds which are ordinarilj" wholesome ma}^ under certain conditions
be harmful. Thus, there is a widespread and apparently justifiable
prejudice against moldy or decomposing feeding stuflFs. Experiments
carried on at the Kansas and Indiana stations showed that the contin-
ued feeding of moldy corn induced intestinal and nervous disorders
of a serious nature. It is a matter of common observation that feed
which has been wet will ferment or sour readily and cause intestinal
disorders. This has to be guarded against especially in warm climates.

Plants which are ordinarily wholesome may become harmful if
infested with ergot. The effect of ergot on horses has been studied by
the Iowa, Kansas, and Montana stations and others. It is generally
conceded that the presence of ergot is a cause of rheumatism. Some
feeds which are regarded as wholesome when properly fed may some-
times prove injurious if fed for a long time or in improper quantities.
Thus, millet hay, in many sections of the Western United States, is
believed to cause the so called millet disease of horses. This question
was studied by the North Dakota Station. It was found that long-
continued feeding of millet hay caused lameness and other symptoms
of poisoning, but the specific cause to which the dangerous properties
of millet are due was not learned, though later work at the station
indicates that it is a glucosid.

An explanation of the poisoning of stock by young sorghum and
some other forage plants is offered b}^ the discovery of a peculiar
glucosid in a number of varieties of sorghum {Sorghum vulgare), which,
under the influence of a special ferment present in the plant, liberates
prussic acid. It is thought probable that this acid, which is a ver}'^
active poison, may be likewise liberated in the digestive tract of ani-
mals feeding on the young plants.

For a number of years the Nebraska Experiment Station has studied
sorghum poisoning, and has recently demonstrated the presence of
prussic acid in the green leaves of young and old sorghum plants and
Kafir corn. The poison, it is stated, is alwa3\s present in at least
minute traces, but ])ecomes dangerous only when the plant is arrested
by dry weather at certain stages of its growth. Sunlight, such as pre-

170

28

vails in the arid and semiarid regions of the United States, causes the
development of the poison in excess.

METHOD OF FEEDING.

The method of feeding is a subject which is often discussed, the
questions of especial interest being the comparative merits of cooked
and raw feed, dry and soaked grain, ground and unground grain, and
cut or chaffed and uncut coarse fodder. The number of experiments
which have to do with these topics is not large.

COOKED AND RAW FEED.

One of the early French investigators compared oats and an equal
volume of rye boiled until the grain burst. The results were not favor-
able to cooking the feed. According to another of his tests, 30.8 pounds
of mashed steamed potatoes could not replace 11 pounds of hay. The
potatoes were mixed with cut straw and fed cold.

It is often claimed that cooking feed increases its palatability and
digestibility. The general conclusion drawn from tests with farm
animals is that this belief is not warranted, and that the cost of cook-
ing is not made up for by the increased value of the ration. It has
been stated on good authority that boiled feed is useful for colts, brood
mares, and stallions if fed two or three times per week, and that draft
horses which are being prepared for sale or for exhibition may be
given cooked feed once a da}^ with advantage. An excellent feed for
horses, it is said, ma}" be made by boiling barley and oats in a kettle
with considerable water and pouring the mass over chaffed hay, allow-
ing the whole to stand until the ha}' is well softened. Bran, roots,
and a small quantit}^ of oil meal may be added also.

DRY AND SOAKED FEED.

It is often claimed that soaking feed, especially hard grain, renders it
more easil}^ masticated and improves its digestibility. It is doubtful
if the matter is as important with horses as some other classes of farm
animals. It has been found in experimental tests that healthy horses
with good teeth digested dry beans and corn as well as the same mate-
rials which had been soaked in water for 21 hours.

Soaking or wetting feed may sometimes be of importance as regards
the health of horses. According to the experience of an English
feeder, chaffed straw, which was fed on account of a shortage in the
hay crop, gave better results when soaked than when dry. The dry
material caused colic and constipation. It was also observed that the
horses relished soaked grain (corn and oats 1:1).

It is believed that the dust in hay causes heaves, and to avoid such
trouble both long and cut ha}^ especiall}^ clover, is very often damp-
ened before feeding, to lay Ihe dust.

170

24

GROTTND AND UNQBOUND FEED.

Opinions differ as regards the advantages of grinding grain. For
horses which are out of the stable during the day and worked hard, it
is quite generally believed that all grains, with the possible exception
of oats, should be ground, and for those at extremely hard work, all
grain should be ground and mixed with chaffed hay. For idle horses
oats or grain should not be ground, nor should hay or straw be chaffed.
In other words, provided the animals have time to masticate their
ration thoroughly, grinding is not necessary. When this is not the
case, grinding takes the place of thorough mastication to some extent,
and increases the assimilation of the ration.

When whole oats were compared with ground wheat and bran at the
North Dakota Station, the horses fed the former ration ate somewhat
more and showed a slight loss in weight, while doing a little less work
than those fed the ground grain. At the Utah Station, tests of the
comparative merits of ground and unground corn, oats, and wheat fed
under different experimental conditions indicated that the ground and
unground grains were equally satisfactory. When whole and ground
oats, corn, and barley were compared for colts at the Iowa Station,
somewhat larger gains were made on the ground feed.

The comparative digestibility of different ground and unground
feeding stuffs was tested at the Maryland Station. It appeared that
ground corn and oats were more thoroughly digested than the unground
grain. In this connection it may be noted that similar results have
been obtained in tests with other farm animals, but it is commonly
believed that the difference in digestibility is often not sufficient to pay
for the cost of grinding.

From all the American tests, and those which have been made in
Europe, it appears fair to say that there is no very marked advantage
in grinding grain for healthy horses with good teeth.

CUT AND UNCUT COARSE FODDER.

It is perhaps the general opinion that when horses have ample time
for chewing and digesting their feed there is no necessity for chaffing
or cutting hay and straw. When the time for feeding is limited
chaffing and cutting coarse fodder is regarded as advantageous. This
is an item of special importance with hard-worked horses kept in the
stable only at night. Furthermore, chaffed feed occupies less space
for storage than uncut ha}^ or straw, and can be readily handled.
Shredding corn fodder is regarded as an economical practice, but
apparently few experiments on the comparative merits of shredded
and whole corn fodder for horses have yet been reported. No marked
variation was observed in the weights of two lots of horses fed whole

25

and cut timothy or whole and cut alfalfa and clover hay mixed in a
test carried on at the Utah Station.

At the Maryland Station, in studies of the digestibility of a number
of whole and ground feeds, it was found that grinding corn shives —
i. e., cornstalks from which the blades, husks, and pith are removed —
until the material resembled coarse bran did not destroy its value as a
coarse fodder, and that the finely ground material supplied the neces-
sary bulk to the ration as well as the same material unground. It
was further claimed that the finely ground coarse fodder possessed an
advantage over the unground material in that it could be mixed with
grain to form a well-balanced ration and fed to horses on shipboard,
or under similar conditions, more readily than unground fodder and
grain.

FATTENING HORSES FOR MARKET.

Fattening horses so that they will reach market in good condition
for sale is quite an important industry in some regions. For instance,
in Iowa there are a number of feeders who thus prepare large num-
bers of horses for the Chicago market, and ofiicials of the Iowa
Experiment Station have gathered some data on the subject. The
general practice is to feed generously and give little exercise. With
proper feeding and care, as many as a dozen horses of a lot fed for
market have in some instances made an average gain of 3. 75 pounds
per head per day throughout a period of ninety days. Somewhat
larger gains have been made under exceptional circumstances.

WATERING HORSES.

A discussion of the subject of watering horses should take into
account th& reasons why water is needed, the amounts required, the
proper time for watering, and related topics.

Horses, like other animals, require water, which should always be of
good quality, for moistening their food, so that the digestive juices may
permeate it readily, for diluting the blood and other fluids of the body,
and for other physiological uses. It may be assumed that under any
given normal condition the body contains a definite amount of water.
When any considerable amount of water is lost from the body, a
sensation of thirst is experienced, showing that more water is needed
to take its place. Practically all the water excreted leaves the body
in the feces, urine, perspiration, and breath. The amount eliminated
in each increases with the amount of water consumed, the largest
amount being excreted in the feces.

In addition to the water drunk by horses, a considerable amount is
obtained in the more or less succulent food eaten. The amount of
water required is influenced by a number of factors, including the

170

26

season of the year, temperature of the surrounding air, character of
the feed, the individual peculiarities of the horse, the amount and
character of the work performed, and probably others. The amount
of water needed increases with the temperature and with the amount
of work performed, since it is ver}^ evident that both of these factors
increase the amount which is given off from the body in the form of
perspiration. Muscular work also increases the amount of water
vapor excreted in the breath.

It has been found that less water is required when the ration con-
sists largel}^ of concentrated feed than when large amounts of coarse
fodder are consumed, and it is a matter of common observation that
less water is consumed when green, succulent feeds form a consider-
able part of the ration than when it consists of dry feed. That the
amount. of water taken, even in dry feed, may be considerable is shown
by the fact that a ration of 12 pounds of oats and 15 pounds of hay
furnishes some 4 pounds of water. A succulent ration would furnish
much more.

In general, a horse will drink from 50 pounds or less to 65 pounds
per day, though under the influence of warm weather or hard work
the amount may range from 85 to 110 pounds or over. In some
experiments in the British army it was found that when allowed to
choose, horses drank about one-fourth of their daily allowance in the
morning and not far from three-eighths at noon and about the same
proportion at night.

In connection with a number of the tests at the experiment stations
in the United States the amount of water consumed has been recorded.
At the New Hampshire Station, on a ration of different grain mixtures,
with timothy ha}^ and corn fodder, the quantity of water varied from
71 to 90 pounds of water per head per day, both the ration consumed
and the amount of work performed influencing' the quantit}' of water
drunk, although the individuality of the horse had the most marked
effect. At the Utab Station it was found that larger amounts were
consumed on alfalfa hay with oats than on timothj" hay, the greater
consumption of water on the former ration inducing a greater elimi-
nation by the kidne3^s; but so far as could be observed this was not
attended by any bad results, nor was it found inconvenient.

A pair of mules, at the Oklahoma Station, during the hot summer
weather, drank 113 pounds of water per head dailj^, and on one day 175
pounds. In another test, at moderate work, the amount recorded was
107 pounds. In these tests the grain ration consisted of Kafir corn,
maize, oats, and bran.

The proper time to water horses is a matter concerning which
opinions differ. Many feeders believe that thc}^ sliould be watered
before feeding, Avhile others are equally certain that feeding should
precede watering. Some extended experiments have been recently

27

made in Europe which have led to definite conclusions, and seem to
have reached the truth in the matter.

The rations fed consisted of different mixtures of corn, oats, hay,
and straw, and a number of experiments were made in which the only
condition which varied was the time of watering'. In some of the
tests the horses drank befoi'e and in some after eating, and in others
after the grain portion of the ration was eaten, but before the hay.

So far as was observed the time of drinking had no effect on the
digestibility of a ration of grain and hay. When hay only was fed
there seemed to be a slight advantage in watering before feeding.
The general conclusion was drawn that horses may be watered before,
during, or after meals without interfering with the digestion and
absorption of food. All these methods of watering are equally good
for the horse, and each of them may be employed according to circum-
stances. It is obvious that certain circumstances may make it neces-
sary to adopt one or the other method. For instance, after severe loss
of water, such as occurs in consequence of long-continued, severe
exertion, the animal should always be allowed to drink before he is
fed, as otherwise he will not feed well.

In this connection it is worth noting that many American farmers
believe that watering before feeding is best. Although all methods
of watering seemed in these tests to be equally good for the horse, it
is not desirable to change unnecessarily from one method to another.
Animals, or at least some of them, appear to be not altogether indiffer-
ent to such a change. In the experiments referred to above it was
found that whenever a change was made from the plan of watering
after feeding to that of watering before, the appetite fell off for some
days; not that the horses did not consume the whole of the food given
to them, but for some days together they did not eat with the same
avidity as before, and took a longer time to consume their rations
completely. A similar effect was not observed when the change was
from watering before to watering after feeding, or from watering
after to watering during meals, or when the change was in the oppo-
site direction to the last. It seems best, therefore, to avoid sudden
and unnecessary changes in the method of watering.

DIGESTIBILITY OF FEEDING STUFFS.

In the preceding pages reference has been made to the composition
of different feeding stuffs and to tests of the comparative value of
different concentrated feeds and coarse fodders. The real value of
any feeding stuff is determined, not alone by its composition, but also
by its digestibility; that is, by the amount of material which it gives
up to the body in its passage through the digestive tract. It is evi-
dent that if two feeding stuffs have practically the same composition,
but one gives up more material to the body than the other — that is, is

170

28

more thoroughly digested — it must actually be more valuable than the
other material. The bulk of the substance of almost all feeding stuffs
is insoluble when eaten. Only material in solution can pass through
the walls of the stomach and intestines into the circulation and be
utilized by the body, therefore digestibility consists chiefly in render-
ing insoluble materials soluble. This is effected by the aid of digest-
ive ferments and also by bacteria.

Digestion experiments are frequently made to learn how thoroughly
a given feeding stuff or ration is assimilated. The usual method is to
feed the material under consideration for a longer or shorter time, the
amount and composition being determined. From the total nutrients
consumed, the amounts excreted undigested in the feces are deducted,
showing the amount of each retained in the body. It is the usual cus-
tom to express the amounts digested in percentages, the results thus
obtained being termed coefficients of digestibility.

The digestibility^ of a number of different feeding stuffs has been
tested with horses in this country and in Europe, although the number
of such experiments is much smaller than in the case of cattle and
sheep. The most extended series of American experiments with
horses was carried on at the Maryland Experiment Station.

The average results of the available digestion experiments with
horses were used to compute the digestible nutrients furnished per 100
pounds b}^ the different feeding stuffs included in the table on page 10.

It has been found that in the majority of the feeding stuffs tested
the percentage of protein digested is fairly high, being greater in
grains and seeds than in hay and grasses, and least in the case of timothy
hay and spelt straw.

Generally speaking, the values obtained for the digestibility of fat
are rather low, the fat of oats being most digestible and that of peas
least digestible. There are reasons connected with the analj^tical
methods commonly followed which render the results obtained with
fat not altogether satisfactory.

Nitrogen-free extract is quite thoroughl}^ digested by horses, the
values ranging, in a number of experiments, from 100 per cent in the
case of molasses to 17.9 per cent in the case of spelt straw. The prin-
cipal sources of nitrogen-free extract in the ration are the cereal grains
and their by-products, and it is interesting to note that the coefficients
of digestibility of nitrogen-free extract of these materials is high. In
the majority of feeding stuff's the crude fiber is not ver}^ thoroughl}"
digested, the coefficients of digestibility being on an average less than
50 per cent.

COMPARATIVE DIGESTIBILITY BY HOBSES AND RUMINANTS.

In computing the digestible nutrients furnished by different feeding
stuffs, it has been a common custom to use availa])le data ol)tained from
digestion experiments with farm atiimals without distinguishing

170

29

between ruminants, like the cow, sheep, etc., and nonruminants, like
the horse, although differences had been pointed out by a number of
observers. Averaging- the results of a considerable number of tests,
it appears that ruminants digest 26.9 per cent more protein, 5.4 per
cent more fat, 16.7 per cent more nitrogen-free extract, and 4 per
cent more crude fiber from timothy hay than horses. In the case of
oats, the amounts of protein digested were practically the same, but
the ruminants surpassed the horses by 12.8 per cent for the fat and
0.5 per cent each for the nitrogen-free extract and crude fiber. Sim-
ilar results were obtained with other coarse fodders and concentrated
feeds. Considering all the available experiments bearing on this sub-
ject, it seems fair to conclude that in general ruminants digest a larger
percentage of fat, carbohydrates, and crude fiber than horses, the
differences being most marked in the case of the crude fiber. These
results are in accord with what might be expected from differences in
the digestive organs of the different classes of animals. It is well
known that fineness of division is an important factor in considering
the thoroughness of digestion. The length of time any given food
material remains in the digestive tract is also important. The rumi-
nants have an opportunity to chew their food more thoroughly than
horses and retain it longer in the digestive tract. It is said that on
an average horses retain their food 4 days or less; cattle 3 or 4 to 7
or 8 days; sheep or goats from 3 or 4 days with ordinary rations to 7
or 8 da3^s when straw is eaten. That the food is actually more finely
divided b}' ruminants in chewing and digesting is indicated by the
mechanical condition of the manure, that from horses containing an
abundance of fairly large fragments of hay and other coarse fodders,
etc., while the manure of cattle commonly contains undigested residue
in a finer state of division. In the case of sheep the manure contains
the undigested residue in still smaller fragments. It is perhaps gener-
ally believed that crude fiber is chiefly digested by the action of bac-
teria in the intestine, and it is obvious that the longer materials remain
in the intestine the greater the opportunity for the action of such
micro-organisms.

The fact that, other things being equal, horses digest their feed less
thoroughly than cattle, i. e., retain less nutritive material from any
given ration when it passes through the digestive tract, has been long
recognized. For this reason horsernanure is richer than manure from
cattle on the same ration. In other words, the horse manure contains
a larger proportion of the ration than cow manure, and hence, more
of the nitrogen and mineral matter, especially phosphoric acid and
potash, originally present in the feed.

The value of the manure produced by horses was studied by the
Pennsylvania Station. Observations made with a number of horses
indicate that a horse produces annually about 12,700 pounds of fresh

170

manure, not including the amount dropped while at work. This quan-
tity, which would be worth about ^13.50 as fertilizer, would require
the use of about 2,500 pounds of straw for bedding. According to
the author's calculations a ton of wheat straw economically used for
bedding horses may result in 6 tons of fresh manure, although in gen-
eral practice the amount is not likely to exceed 5 tons and may be
much less if few animals are kept or the manure is infrequently
removed.

RATIONS ACTUALLY FED AND FEEDING STANDARDS.

The amount of the different feeding stuffs required and hence the
quantity of nutrients supplied to horses may be learned by observa-
tion or experiment or a combination of the two methods. Doubtless
all practical horse feeders supply rations which they believe are suited
to their horses' needs, and in stables where horses are fed in any con-
siderable number economy demands that the amount fed shall be fixed
and not vary according to the whims of the feeder. When the feed-
ing stuffs used are weighed and the condition of the horses is noted, a
feeding experiment results. Using average values obtained from
many more or less complicated feeding experiments and other investi-
gations, so-called feeding standards have been devised which are
designed to show the amount of protein, fat, and carboh3^drate£
required per day for various conditions of work and rest. For the
sake of uniformity, the standards arc usually calculated on the basis of
1,000 pounds live weight. They often show in addition the nutritive
ratio; that is, the ratio of protein to the sum of the carbohydrates
and 2.25 times the fat. It is also possible to express the feeding stand-
ards in terms of protein and energy, since the functions of food, as
previously stated, are to build and repair tissue and suppl}^ energy,
protein alone serving for the former purpose, while all the nutrients
^deld energy. The best known feeding standards for horses and other
farm animals are those computed by Wolff and revised by Lehmann.

Very frequently so-called standards for horses have been proposed
which have shown the quantities of feeding stuffs required; for in-
stance, the pounds of oats and ha}^ needed per da}^ per 1,000 pounds
live weight. Such standards, or more properly standard rations, have
been aVlopted in many countries for army horses, and in other cases
where large numbers of horses are fed under uniform conditions. The
digestible nutrients furnished by such standard rations can be calcu-
lated by the aid of figures showing the average composition and diges-
tibility of the feeding stuffs.

The table following shows the amount of nutrients and energy fur
nished per 1,000 pounds live weight by rations supplied the IT. S.
Army horses, by those fed to a number of farm horses at the stations,

170

31

and work horses employed by packing houses, express companies, and
other companies, and also the average nutritive value of a considerable
number of such rations fed in different parts of the United States, as
well as the commonly accepted feeding standards. The amount of
digestible nutrients furnished by the rations is also included, such
data having been calculated by the aid of figures recorded elsewhere
(see page 10).

Table 2.-— Rations <t.cinally fed to horses and digestible nutrients and energy in rations
calculated to basis of 1,000 pounds live weight.

oi
o

"c

"5)

"S

Rations
actually fed.

Nutrients in ration per
1,000 pounds live
weight.

Digestible nutrients in
ration per 1,000
pounds live weight.

3
1

Kind of horses.

a
B
S

Em

(a

0)

(V

tC
0)

■a
p

5

a
%

S
a,

2«

U OP

a)

3
u

n

a

ARMY HORSES.

United States:

Cavalry

Lbs.
1,0,50

1,125

1,025

}l,200
1,050

Pounds.

fOats, 12

\Hav,14

lOats, 12

\Hay,14

JOats, 9

tHay,14

1

(Alfalfa, 21.25..

IStraw, 3.2

jOats, 10

lHay,12

Lbs.
1 2.14

I 2.00

I 1.84

}-«

1 2.06

X6.S.
0.90

.84

.78

.18
.76

Lbs.
12. 82

11.9*;

11.39

5.87
10.42

Lbs.
4.95

4. 62

4.80

2.34
3.87

Lbs.
1.25

1.16

1.00

1.76
1.40

Lbs.
0.57

.53

.48

.05
.40

Lbs.
8.00

7.48

6.88

3.68
6.97

Lbs.
1 97

Calo-
ries.
95 5fin

1 84 '21 750

1 94 9n 95in

HORSES WITH LIGHT
WORK.

Driving horse, Wyo-
ming Station.

.92
1.44

11,8.55
19,935

2.22

.47

8.15

3.10

1.58

.22

5.27

1.18

15,895

1,400
1, 350

(Groundgraiii,
\ 9.38.

|Hay,18

(Oats, 4

lHay,15

Fire company horses:
Boston, Mass

Chicago, 111

I 1.65
1 1.00

.68
.43

9.57
6.77

4.57
3.50

.87
.42

.41
.24

6.14
3.70

1.73
1.45

18,000
11,365

Average of 6, in-
cluding above.

1.35

.56

7.95

3.20

.78

.35

4.99

1.26

14 555

1.57

.54

8.00

3.18

.99

.32

5.06

1.24

14 890

for light work.

|l,400

1,325
1,325

fCorn, 4.67

Oats, 5.33

• Bran, 0.83

Corn meal, 4. 16

Hay, 15

(Corn, 2

lOats, 19

1 Bran, 1.5

[Hay, 9.5

(Corn, 12

■^Oats, 5.25

Hav, 20

■

HOR.SES WITH MOD-
ERATE WORK.

Kxpress horses:

Richmond, Vn.,
summer.

Jersey City, N.J...
Boston , Mass

• 1.79

i 2.45
i 2.38

.78

1.03
1.04

11.78

13. 45
14.96

3.64

3.57
5.32

.97

1.66
1.28

.45

.67

8.19

9.37
9.75

1.46

1.32
2. 12

21,650

25, 800
27, 000

Average of 4, in-
cluding above.

2.15

.93

13. 27

4.13

1.26

.55

9.06

1.62

24 55C

170

32

Table 2. — Rations actually fed to horses and digestible nutrients and energy in rations
calculated to basis of 1,000 pounds live weight — Continued.

Kind of horses.

Ration.8
actually fed.

Nutrients in ration per
1,000 pounds live
weight.

Digestible nutrients in
ration per 1,000
pounds live weight.

HORSES WITH MOD-
ERATE WORK — con-
tinued.

Cab horses:

Washington, D. C.

San Francisco, Cal.

Average of 4, in-
cluding above.

Farm horses:

Wyoming Station . .

New Hampshire
Station.

New Jersey S tation

Massachusetts Sta-
tion.

Utah Station

Lbs. Pounds.

fOats, 10...
1,200,-^ Corn, 5

IHay, 23...

Lbs,
2.56

1 oka' /Oats, 8..
l'^50|Hay,16.

1,000

}■•■

Do.

Average of 41, in-
cluding above.

General average
for moderate
work.

Farm mules, Virginia
Station.

Average of 6, in-
cluding above.

HORSES WITH SEVERE
WORK.

Truck and draft horses:
Chicago, 111., daily

ration.
South Omaha,

Nebr.

Average of 5, in-
cluding above.

170

>1, 310

h,500
!■!, 500

Lbs.
1.12

.69

/Alfalfa, 13.76.
\Straw, 2.26...

I Bran, 2
Corn, 6
Gluten meal, 6
Hav, 10

fHav, 6

Bran 2^-

ICorn, 4f

Dried brewers'
I grain, 8|.

Hay, 18

\VlH'atbran,2.
Il'rovender, 6=
) crushed
corn, 2.73;
[ oats, 3.27.

I Alfalfa hay,
25.
Bran and

shorts (1:1),

10.
Timothy hay,

22.8.
Bran and

shorts (1:1),

10.

il. 85
2.37

i 3.21

2.46

fHay, 15.2....
ICorn, 10.5....
I Corn silage,
I 10.5.

fOats, 7.6 .
IHay, 20..
) Oats, 15..
\Hay, 12..

1.65

Lbs
16. 50

8.87

Lbs
6.43

Lbs.

1.28

.70

Lbs
0.63

Lbs.
10.42

Lbs
2.60

4.30

7.33

.14
.93

6.27
10.49

1.3
1.69

4.03

7.47

.75

.78

.58
.70

7.04

1.11

6.56

4.05

1.57
1.49

8.09
8.09

11.64

8.99
9.67

4.34
3.27

.64
1.04

5.11
6.23

33

Tahlk 2. — Rations actnalhj fed to horses and digestible nutrieids and energtj in ratipus
calculated to basis of 1,000 pounds live weight — Continued.

O

Rations
actually fed.

Nutrients in ration per
1,000 pounds live
weight.

Digestible nutrients in
ration per 1,000
pounds live weight.

1

Kind of horses.

"3
c

M

Co'
be'-'

U4

0)

•a

3

'S
o

0-

-.J

0)

a

^0
taoC

a

FEEDING STANDARDS
AND AVERAGE RA-
TIONS.

Light worlc, Wolff-

Lbs.

Pounds.

Lbs.

Lbs.

Lbs.

Lbs.

Lb.'<.
1.5

•2.0

2.5

2. 14

1.95

1.60

1.10
1.30

1. .58
.99

1.06

1.57

1.49

.69

1.12

Lbs.
.40

.60

.80

.52

.44

.40

.22
.32

.49

.40
.42
.39

.49

LM.
9

Lbs.

5

C'alo
ries.
22,150

Lehmann.
ISIedium work, Wolff-

11.0
13.3
11.15

9.93

12. 14

"11.0 .
"11, n

26 700

Lehmann.
Heavy work, Wolff-

32,7-50
26,900

23, 950

•'7 200

Lehmann.
Maintenance, moder-

ate work, original,
Grandeau.
Maintenance, moder-

ate work, modified,
Grandeau.
Paris Bus Co., horses.

Lawes & Gilbert's
computation.

Ordinary work, Lava-
lard.

Severe work, Lavalard

AMERICAN EXPERI-
MENTS.

Horses with light
work:
Driving horses

'''' 510

22,880

5.27
5.06

7.33

8.09
8.09
7.95

6.94

1.18

General average

1.2414,890

1.72 20,860
1 62 2'' 760

Horses with moderate
work:
Express and cab

horses.
Farm horses

General average

1.63 22,710
1.60 90 fiV.'S

Mules with moderate

work: Farm mules.
Horses with severe

1.35

19,560

work: Truck and
draft horses.

"This value represents total carbohydrates plus 2.25 times the fat.

As will be seen, the average values for the protein and energ}^ in
the rations of the horses performing light work are considerably less
than similar values for horses performing moderate work. The data
for the former group is much more limited than for the latter, but the
relation is in accord with the commonly accepted theories. The farm
mules consumed a ration furnishing less protein and practically the
same amount of energy as horses performing similar work, though the
tests with mules are too few for general deductions. The rations of
the truck and draft horses performing severe muscular work furnished
less protein and energy on an average than the rations of the horses
25352— No. 170—03 3

34

with moderate work. This is not in accord with commonly accepted
theories, for it is generally conceded that horses at severe work
require larger rations than those at moderate work. The discrep-
ancy may be explained in part perhaps by the fact that the data
for the group performing severe work is much less extended than
that for the group performing moderate work. There is ever}^ reason
to suppose that the truck and draft horses received rations sufficient
for their needs, as the firms owning them are known to make the
efltort to maintain their horses in good condition. Such truck and
draft animals are often emplo5^ed at work which is performed at a slow
pace, and undoubtedly this has a bearing on the fact that they were
able to perform a large amount of work on a comparativel}^ small
ration, as the speed at which work is performed has a marked effect
upon the food requirements.

The average values, representing the amounts which were fed to
American horses performing light, moderate, and severe work, differ
somewhat from the commonlj^ accepted feeding standards. It would
be going too far to propose the adoption of these average values as
standards in the place of those which have been commonly accepted.
It is undoubtedly true that a feeding standard should be based on other
data than the results of feeding experiments; however, in so far as the
results represent the average practice of successful feeders they are
worthy of consideration, and certainly emphasize the importance of
undertaking investigations with a view to revising the standards. It
should be remembered that the amounts of digestible nutrients in the
rations actually fed were calculated with the aid of coefficients of
digestibility obtained with horses and are, therefore, considerably
lower than would be the case if average values obtained with ruini-
nants had been used, a method of calculation which has been often
followed in the past, but which does not seem desirable.

The number of feeding stuffs used in making up the rations fed was
not found to be large, oats and corn being the common grains, and
ha}", usually timothy, the common coarse fodder. The amounts of
nutrients and energy in the different rations of the horses making up
the different groups varied within rather wide limits, which is not sur-
prising when it is remembered tliat the horses were fed under many
different conditions and by a large number of feeders whose opinions
regarding what constituted a proper ration naturallv differed.

The rations given in Table 2 and those used in calculating the aver-
ages there included were believed to be sufficient for the horses' needs
either because the animals maintained a practically constant weight, as
in the case of the horses fed at the experiment stations, or because the
rations had stood the practical test of usage at the hands of express
companies, cab companies, etc. Several additional rations follow,
which may perhaps serve as a guide in determining the kind and

170

35

amount of feeds which sliould be given to work horses under different
conditions.

The New Hampshire Station found that the following rations were
moderate in cost and sufficient in amount for farm horses weighing
between 1,200 and 1,300 pounds:

Ration No. 1. Timothy hay 10 pounds, ])ran 2 pounds, corn 6 pounds, and gluten
feed 6 pounds.

Ration No. 2. Timothy hay 10 pounds, corn S pounds, and bran 7 pounds.
Ration No. 3. Timothy hay 10 ])ounds, corn 8 pounds, and linseed meal 4 pounds.

As shown by correspondence a favorite ration with feeders in differ-
ent cities for truck horses weighing some 1,500 pounds is made up of
15 to 20 pounds of oats and 12 to 20 pounds of hay. Some feeders
prefer corn and oats in equal parts instead of oats.

In Table 2 the ration for arm}- horses w^eighing about 1,100 pounds
is given as oats 12 pounds and ha}' 11 pounds. According to the army
regulations a like amount of corn or barley may be supplied in the
place of oats.

The Iowa Station work horses, weighing 1,200 pounds, according to
a recent publication, are fed 12 pounds of hay and 12 pounds of grain
(oats, corn, and bran 3:2:1) per head daily. If oats are high in price
the amount of corn is increased, the grains being mixed in the propor-
tion of 2:2:1. Horses weighing 1,500 to 1,600 pounds receive 15
pounds of hay and 15 pounds of the above grain mixture. This, it is
said, has been found sufficient to keep them in good flesh during heavy
work. For ordinary work horses weighing about 1,300 pounds a
ration of 10 pounds of oat straw and 15 pounds of equal parts of corn
and oats by weight is considered sufficient. At severe work the mix-
ture should consist of 3 parts of oats to 2 of corn.

The California Station recommends, per 1,000 pounds live weight,
the following combinations among others as suited to Pacific coast
conditions:

Ration No. 1. Alfalfa hay 12 pounds, wheat hay 11 pounds, and crushed barley 7
pounds.

Ration No. 2. Alfalfa hay 10 pounds, barley hay 12 pounds, and cracked corn 7
pounds.

As a sample of a ration containing molasses the following may be
cited which has been satisfactorily fed to a large number of draft
horses averaging 1,700 pounds in weight: Night and morning a quart
of molasses diluted with 3 quarts of water and thoroughly mixed with
6 pounds of cut hay of good quality, 1.5 quarts of corn meal, and 2.5
quarts of coarse bran. In addition the horses were given 5 quarts of
dry oats in the middle of the day and 11 pounds of long hay at night.

An English authority recommends the ration given below, which is
interesting as an example of the use of roots: For work horses 12
pounds of oats, 15 pounds of hay, and 5 pounds of carrots. A more

170

36

abundant ration suited to more severe work is 20 pounds of oats, 10
pounds of ba}^ and 3 pounds of carrots.

For farm borses at light work Settegast recommends 6 to 10 pounds
oats, 6 to 9 pounds ba^', and 3 pounds straw. For medium work 10
pounds oats, 10 pounds bay, and 3 pounds straw. For beavy work 13
pounds oats, 12 pounds ba}', and 3 pounds straw.

A ration proposed b}^ Sidney for a draft borse at beavy worK is of
interest because beans replaced some of the grain ordinarily fed. The
ration consists of 13 pounds oats, 6 pounds beans, 3 pounds corn, and
15 pounds chaffed clover ha}^

The above rations are not especially recomiuended, but are quoted
as illustrations of the ways in wbicli feeding stuffs can be com))ined.
Each feeder should decide upon a ration which makes the most economi-
cal use of the local feed supplv, taking care that it furnishes in reason-
able combination nutritive material sufficient for the amount of work
required.

METHOD OF CALCULATING RATIONS.

The feeding value of anv ration may be readily calculated and com-
pared with the standards. Suppose a horse at moderate work and
weighing 1,200 pounds is fed 11 pounds of oats and 10 pounds of tim-
othy hay daily. The Wolff-Lehman n feeding standard for horses at
moderate work calls for 1.8 pounds of protein and 26,700 calories per
thousand pounds live weight. A borse weighing 1,200 pounds would
therefore require 1.2 times as much, or 2.2 pounds protein and 32,000
calories. Oats contain 9.39 pounds of digestible protein and 122,100
calories per hundred pounds. Eleven pounds would therefore furnish
1.08 pounds of protein (9.39 X 0.11 = 1.03), and 13,431 calories (122,100X
0.11 = 13,-131). Timoth}' haj^ furnishes 1.25 pounds protein and 69,850
calories per hundred pounds. Ten pounds would therefore furnish
0.13 pound protein (1.25x0.10 = 0.13) and 6,985 calories (69,850X
0.10 = 6,985). The sum of tbe nutrients furnished by 11 pounds of
oats and 10 pounds of hay would tbereforc be 1.16 pounds protein and
20,415 calories, or 1.04 pounds protein and 11,585 calories less than
the standard calls for. This may be made up ))y adding more oats,
bay, or other feeding stuff. Tbe amount of oats required to furnish
the necessary protein may be learned from the proportion 100:9.39::
a?: 1.04; or, in other words, b}^ dividing 104 by 9.39, wbich gives
11.07. This quantity of oats would also furnish 13,517 calories, mak-
ing the total protein of tbe ration 2.2 pounds and the total fuel value
33,932 calories. Tbe fuel value of tbe ration is in excess of the stand-
ard, though tbe agreement is close enough for all practical purposes.

It will be remembered that it is not necessary tbat the amounts
furnished in a ration shall exactly e<iual thos(^ called for by the
standard, but rather tbat tbey approximate them, being greater rather
no

b7

than less through a long- period. Rations which will furnish the
amounts called for by other feeding standards, or by the average
values deduced from American rations, can, of course, be calculated
in the same way. As will be noted, the amount of feeding stuffs
necessar}^ to provide nutrients equal to the amount called for by the
Wolff standard for a horse at moderate work is large compared with
the amounts f)rdinarily used in this country.

MUSCULAR WORK AND ITS EFFECT ON FOOD REQUIREMENTS.

It is commonly said that the amount of food required l)}^ horses is
proportionate to their weight; it being self-evident that a large horse
would require more material than a small horse to build and repair
the body and to carry on all the vital processes which constitute
internal muscular work. Investigations have shown that the require-
ments are more nearly proportional to the surface areas than to the
body weight. Individual peculiarity is, of course, a factor which
must be reckoned with, but the general statement is justified. The
factor which has the greatest influence on the ration required is the
amount of work performed, the ration increasing with the work.
When horses M'hich have been consuming a large ration and perform-
ing work are compelled to rest, even for a few days, the ration should
be diminished.

In order to study the effects of work upon the amount of food
required it is necessary to have some means of measuring and com-
paring the different kinds of work done.

MEASURING MUSCULAR VORK.

It has been said alread}- that the total work performed by a norse
consists of internal and external muscular exertion. The former
includes the force expended in the digesting of food, the beating of
the heart, etc.; the latter that expended in moving the body, i. e., in
the motion of forward progression, and in drawing or carrying a load.
The latter factor is the one of most importance in considering the horse
as a beast of burden. The amount of such muscular work has been cal-
culated or measured in various ways. The methods of calculation are
often complex and need not be discussed in detail.

According to the classic experiments of James Watts, a horse can
exert a power equal to 33,000 foot-pounds per minute, i. e., in one min-
ute can exert a force sufficient to raise 33,000 pounds 1 foot. This value
has been termed one horsepower and has been accepted as a common
unit for the measurement of force. In countries where the metric
system is employed the more common unit is the kilogrammeter.
This unit is equal to 7.2 foot-pounds. According to Watts's values, a
horse working eight hours per day would perform work represented
by 33,000 X 60 X 8 = 15,81:0,000 foot-pounds. Later estimates give

170

35

lower values. It has been calculated that an average horse will pro
duce onl}' about 22,000 foot-pounds per minute, which would be
equivalent to 10,560,000 foot-pounds in a working day of eight hours.

According to German experiments, the day's work of a horse haul-
ing a load eight hours on a level road amounted to 7,999,800 foot-
pounds. Working the same length of time with a d3^namometer the
work amounted to 12,996,000 foot-pounds. Larger values have been
obtained in calculations representing the amount of work performed
daily by army horses.

Taking into account the average amount of muscular work expressed
in foot-pounds, the speed at which work is performed, the duration of
the work, and the amount of work done at a walk and trotting, the
total work done per day by French army horses carrying a rider
weighing 175 pounds without a pack, and 265 pounds with a pack, and
200 pounds with accouterment for maneuvers, has been calculated to
be as follows:

Table 3. — Work performed by French army horses per day.

Work per day.

ORDINARY WORK (RIDER WITHOUT PACK).

Walking.
Trotting .

Total

ROAD WORK (rider WITH PACK).

Walking.
Trotting.

Total

MILITARY MANEUVERS (RIDER WITH LIGHT
PACK).

Walking

Trotting

Total

Weight
carried.

Pounds.
176
176

265
265

198
198

Velocity

per
second.

Feet.
5.446
9.022

5. 446
9.022

5. 446
9. 022

Work per
second.

Foot-lbs.

958.5

1,587.9

1,443.2
2, 390. 8

1,078.3
1,786.4

Duration
of daily
work.

Hrs. mill.
2 30
1 30

1 30
1 30

2 00

3 00

Amoinit

of work at

different

gaits.

Foot-lbs.
8, 626, 500
8, 574, 660

17,201,160

7, 793, 280
12, 910, 320

20, 703, 600

7, 762, 760
19, 293, 120

27,055,880

According to the calculation of an English army officer, the mean
ratio of carrying power to body weight is 1:5.757; that is to sa}^, it
takes, roughly speaking, 5.75 pounds of body weight to cany 1 pound
on the back during severe exertion (racing excepted). The rule he
gives for ascertaining the canning power of a horse is to divide his body
weight by 5.757, and if intended for only moderate work to add to the
product 28 pounds. It has to be noted that the observations on which
this rule is based were made upon military horses. It is doubtful if it
would work out so accurately if applied to all horses used for the saddle.

MUSCULAR WORK IN ITS RELATION TO THE RATION.

Many experiments have been made, chiefly in Eui'opt', to determine
the exact relation Ix'tween the amount of muscular work performed
and the amount of the different nutrients re(]uired per day. It is the

170

39

opinion of many prominent investig'ators that, provided a sufficient
amount of protein is supplied for ph3\siolo^ical maintenance, i. e., to
replace the wear and tear of body tissue, it is immaterial which of the
three classes of nutrients (protein, fat, and carbohydrates) furnishes
the cnerg3^ necessary for external muscular work performed by horses.

A view very commonly held to-day is much the same and in accord
with the above, viz, that provided an adequate quantity of protein and
energy are available for maintenance, it is theoretically immaterial
which class of nutrients furnish the energy for muscular work,
although carbohydrates and fat are practically better suited for this
purpose than protein, since any great excess of the latter is costly and
ma}' prove injurious to the health. In this case the term maintenance
is not used in its strict ph3^siological sense, but refers to a condition in
which no appreciable amount of external muscular work is performed,
and in which, the internal muscular work is fairly uniform from day to
day and the body weight practically' constant.

The speed at which the horse travels, the way in which the load is
distributed, the external temperature, and other conditions evidently
have an effect upon the work performed, increased speed, increased
temperature, and faulty distribution of the load increasing the work.

It is commonly recognized that when work is increased more feed is
required. Many experiments have shown that the pace at which work
is done also has an effect, and in general the greater the speed the
larger the feed requirement. Some of the reasons given for the fact
that rapid work is less economical than slow work are the increased
action of the heart when the horse is trotting or galloping; the lifting
of his own weight at each step only to allow it to fall again, thus devel-
oping heat; and the increase of body temperature with exertion and
the loss of heat b}' the evaporation of water through the skin and
lungs.

A number of investigators have studied the relation between muscular
work and digestibility. Small variations have been observed under
the different experimental conditions, the feed being on an average a
little less thoroughly digested when severe work was performed.
But on the whole it seems fair to say that from a j^ractical stand-
point the diminished digestibility due to muscular work is not very
important.

A recent German investigator found that the amount of food required
was affected by anything that disturbed the horse. In one experiment
a horse confined in a stable was much disturbed by flies and conse-
quently restless. The increased work in fighting the flies caused an
increase of 10 per cent of the carbon dioxid excreted. This means
that more food material was burned in the bod}^ than was the case
when the horse was quiet, for the combustion of food in the bod}', it
will be remembered, furnishes the carbon dioxid excreted in the
breath.

170

40

In addition to other matters, this same investigator noted that the
body conformation had a marked effect on the economical production
of work. He found that defects in external conformation and move-
ments necessitate an increased amount of muscular exertion. This
has an important bearing upon the market value of the horses. Too
low a stall temperature also increases the amount of material required
for maintenance. In many cases observed this increase was hardly
covered by 2 pounds of oats daily.

PROPORTION OF ENERGY OF FOOD EXPENDED FOR INTERNAL
AND EXTERNAL. MUSCULAR WORK.

A horse converts 38.3 percent of the energy of food into mechanical
work. On account of the energy required for respiration, the beating
of the heart, etc., only about 34 per cent of the energy of the food is
actually available for external muscular work. The best, record for a
steam engine is said to be an efficiency per indicated horsepower of
22.7 per cent on the basis of total heat supply. Per delivered horse-
power the amount is probabl}^ 10 per cent less. The animal is, there-
fore, seen to be a much more efficient machine than the engine.

ENERGY REQUIRED TO CHEW AND DIGEST FOOD.

One of the most interesting of the lines of investigation followed in
an extended series of experiments, carried on under the direction of
Professor Zuntz at the Agricultural High School in Berlin, was the
determination of the energy required to chew and digest different
foods. The experiments were complicated and too extended to describe
here except in very general terms. They showed that the respiratory
quotient, i. e. , the ratio of the carbon dioxid excreted in the breath to
the oxygen consumed from the air is a very delicate index of the
changes which take place in the body. It was found that the internal
muscular work expended in chewing, swallowing, and digesting food
could be determined by the variations in the respiratory quotient and
in the amount of carbon dioxid excreted when this kind of work was
performed, as compared with the amount when the animal rested.
Different feeding stuffs modified the respiratory quotient in different
ways, and it was evident that some required more labor for diges-
tion and assimilation than others. This is a matter of considerable
importance, for it is evident that if two feeding stuffs of practically
the same composition are digested with equal thoroughness but one
requires for digestion and assimilation the expenditure of more
internal muscular work than the other, it is really less valuable; in
other words, the two may contain the same amount of digestible
nutrients, l)ut one causes the body more labor to assimilate than
the other. On the basis of Zuntz's average figures of composition and
digestibility, 1 pound of hay furnishes 0.391 pound of total nutri-

170

41

ents, and 1 pound of oats 0.015 pound of nutrients. As regards
nutritive value, hay and oats are therefore commonly' said to be to
each other as -100 : 600. As shown b}- the experiments referred to,
0.123 pound, or 20 per cent of the total nutritive material present
in 1 pound of oats is expended in the labor of chewing and digesting
them. In the case of 1 pound of hay, 0.102 pound, or 4:9 per cent of
the total nutritive material, is required for the same purpose. There-
fore hay and oats stand reall}^ in the proportion of 200 : 490. In other
words, oats surpass hay in feeding value two and one-half times instead
of one-half time, as they are ordinarily assumed to do.

"TRUE NUTRITIVE VAI-UE" OF FEEDING STUFFS.

. Taking into account the internal muscular work required to chew
and digest foods and deducting this from the digestible nutrients pres-
ent in the foods, what we ma}' call the "true nutritive value" of a
number of feeding stuffs was calculated by Zuntz with special refer-
ence to horses. The results are shown in the following table:

Table 4. — Calculated " fitie nutritive value" of 1 jiound of different feeding stuffs.

Feeding stuffs.

Dry mat-
ter.

Crude
fiber.

Total di-
gestible
nutri-
ents, a

Labor expended
in chewing and
digestion.

True nutritive
value.

In
terms of
energy.

In terms
of nutri-
ents."

In
terms of
energy.

In terms
of nutri-
ents, a

Meadow hay (average quality)

Alfalfa hay cut at beginning

of bloom

Per cent.
85

84
84
86
87
87
86
86
86
88
25
15

Pound.
0.260

.266
.302
.420
.103
.017
.069
.059
.157
.094
.010
.016

Pound.
0.391

.453

.407
.181
.615
.785
.720
.087
.645
.690
.226
.113

Calories.
376

394

429
535
224
148
200
183
294
225
49
37

Pound.
0.209

.219
.239
.297
.124
.082
.111
.102
.163
.125
.027
.021

Calories.
328

422

303

-209

883

1,265

1,096

1,054

867

1,018

358

166

Pound.
0.182

234

168

Winter-wheat straw

— 116

Oats (medium quality)

.491
703

.609

Peas

586

Air-dry disembittered lupines.

.482
.565

Potatoes

199

Carrots

092

a Protein, plus carbohydrates, plus crude fiber, plus fat multiplied by 2.4.

As will be seen, the true nutritive value of straw is negative in the
above table. In this connection it was stated that so long as heat
alone is considered, the digestible nutrients in straw should be given
their full value as shown by the heat of combustion. Providing the
labor of digesting a mixed ration does not exceed 4.63 pounds, or
8,316 calories, the digestible nutrients in straw have a positive value.
If the labor of digestion is greater than this, an excess of straw
would only increase the internal muscular work, so that approximately
a quarter of a pound of nutrients per pound is of no value for the
bod3^

25352— No. 170—03 4

42

FIXING RATIONS ON THE BASIS OF INTERNA!. AND EXTERNAL

MUSCULAR WORK.

It was shown in connection with the above tests that a ration suited
to the performance of any kind of work can be calculated on the basis
of the nutritive material and energy required for maintenance plus
that needed for the work performed, though the method is too involved
to discuss in detail. Thus on the basis of experiments and observa-
tions it was calculated that a horse weighing 1,100 pounds requires for
maintenance 7.056 pounds of true available nutrients. Similar calcu-
lations were made for a horse working with or without harness and
wagon on a level and going up or down an incline at different gaits.

It was found that the amount of total nutrients required increases
with the increased speed; furthermore, a greater amount is required
in climbing an incline than for forward progression on a level. In
descending a gentle incline a much smaller amount of nutrients is
required than in climbing the same incline, and as compared with the
motion of forward progression there is also a saving in the amount of
nutrients needed. In general, it was found that the energy expended
was less than in traveling on a level, provided the incline was less than
5° 45'. At this point it was equal to the amount expended in travel-
ing on a level. If the incline was greater, energy was required to
keep the body from descending too rapidly and the expenditure was
greater than on a level.

SUMMARY.

Some of the principal deductions noted in this bulletin follow; the
conclusions which have been drawn for horses applying with equal
force to other animals of the same group, such as asses and mules.

Horses, like other animals, require a definite amount of nutrients
and energy per 1,000 pounds live weight for maintenance, and an
extra amount, chiefly energy -^delding nutrients, for muscular work,
the amount being proportional to the character and amount of work
performed.

The amount of nutrients required increases with the amount of work
done and with increased speed. More energy is required for climb-
ing an incline than for traveling on a level. In descending an incline
of less than 5° 45' less energy is required than in traveling on a level.
If the incline is greater than 5° 45', more energy is expended (to pre-
vent too rapid descent) than in walking on a level.

The ration should consist of concentrated and coarse feeds. The ratio
by weight of coarse fodder or bulky feed to concentrated feed in the
ordinary ration has been found to be about 1:1. Crude fiber may
perhaps be fairly considered as the characteristic constituent of coarse
fodder. The ratio of crude fiber to protein in the average of a large
number of American rations has been found to be about 2:1.

1.70

43

Theoreticallj'' at least any sufficient and rational mixtuie of whole
some grains, by-products, roots, and forage crops, green and cured,
may be used to make up a ration, though there is a very general prej-
udice in favor of oats and haj^ corn and hay or corn fodder, and bar-
ley and hay (frequently that made from cereal grains), the first-named
ration being perhaps that most commonly regarded as satisfactory for
horses. A corn ration is very commonly fed in the middle West and
Southern United States — that is, in the corn-producing belt. The
barley ration is quite characteristic of the Pacific coast region. In
the semiarid regions of the United States Kafir corn and alfalfa have
proved to be of great value, owing to their drought-resisting qualities.
Both crops have been found useful for horse feeding. Of the two
alfalfa has been used much more commonly, and has given very satis-
factory results.

Investigations have shown that it is often best to modify a ration, for
instance, by substituting corn wholly or in part for oats, so that while
the horses remain in good condtion, the cost of the ration is dimin-
ished. AVhere large numbers of horses are fed this is often a matter
of considerable importance.

Generally speaking, horses digest their feed, and especially the
nitrogen-free extract and crude fiber in it, less thoroughly than
ruminants.

Horses require a considerable amount of water daily, the quantity
varying with different seasons of the year, the amount of work per-
formed, etc. The time of watering, whether before or after feeding,
is a matter of little importance, and, generally speaking, may be regu-
lated to suit the convenience of the feeder. Horses become used to
either method of watering, and irregularity should be avoided, as
sudden changes are apt to prove disturbing.

Judging by the average results, representing the practice of a large
number of successful American feeders, and also the results of many
tests at the experiment stations in different parts of the United States,
horses with light work consume on an average a ration furnishing per
day 0.99 pound of digestible protein and 14,890 calories of energy
per 1,000 pounds live weight. Similar values for horses at moderate
work are 1.49 pounds digestible protein and 22,710 calories. It is
believed that for horses at severe work larger amounts are required.
Generally speaking, these average values are less than those called for
by the commonly accepted German feeding standards for horses per-
forming the same amount of work, yet from what is known regarding
the American horses it seems fair to say that they were well fed.

Additional experiments are much needed which will result in a series
of standards suited to American conditions.

170

u

FARMERS' BULLETINS.

The following is a list of the Fanners' Bulletins available for distribution, showing
the number and title of each. Copies will be sent to any address on applieatiou U
any Senator, Representative, or Delegate in Congress, or to the Secretary of Agri-
culture, Washington, D. C. The missing numbers have been discontinued, beinj,
superseded by later bulletins.

No. 10. Leguminous Plants. No. 21. Barnyard Manure. No. 22. The Feeding of Farm Animals
No. 24. Hog Cholera and Swine Plague. No. 25. Peanuts: Culture and Uses. No. 27. Flax for Seec
and Fiber. No. 28. Weeds: And How to Kill Them. No. 29. Souring and Other Changes in Milk
No. 30. Grape Diseases on the Pacitic Coast. No. 31. Alfalfa, or Lucern. No. 32. Silos and Silage
No. 33. Peach Growing for Market. No. 34. Meats: Composition and Cooking. No. 35. Potatc
Culture. No. 36. Cotton Seed and Its Products. No. .37. Kafir Corn: Culture and Uses. No. 38. Spray
ing for Fruit Diseases. No. 3J. Onion Culture. No.'42. Facts About Milk. No. 43. Sewage Disposa
on the Farm. No. 44. Commercial Fertilizers. No. 45. Insects Injurious to Stored Grain. No. 46
Irrigation in Humid Climates. No. 47. Insects Affecting the Cotton Plant. No. 48. The Manuring
of Cotton. No. 49. Sheep Feeding. No. 50. Sorghum as a Forage Crop. No. 51. Standard Varietie:
of Chickens. No. 52. The Sugar Beet. No. 53. How to Grow Mushrooms. No. 54. Some Commoi
Birds. No. 55. The Dairy Herd. No. .56. Experiment Station Work — I. No. 57. Butter Making oi
the Farm. No. 58. The Soy Bean as a Forage Crop. No. 59. Bee Keeping. No. 60. Methods of Curinj
Tobacco. No. 61. A.sparagus Culture. No. 62. Marketing Farm Produce. No. 63. Care of Milk oi
the Farm. No. 64. Ducks and Geese. No. 65. Experiment Station Work — II. No. 66. Meadows ant
Pastures. No. 68. The Black Rot of the Cabbage. No. 69. Experiment Station Work— III. No. 70
Insect Enemies of the Grape. No. 71. Essentials in Beef I'roduction. No. 72. Cattle Ranges of th<
Southwest. No. 73. E.xperiment Station Work — IV. No. 74. Milk as Food. No. 75. The Graii
Smuts. No. 76. Tomato Growing. No. 77. The Liming of Soils. No. 78. Experime'nt Station Work-
V. No. 79. ICxperiment Station Work— VI. No. SO. The Peach Twig-borer. No. 81. Corn Cultun
in the South. No. 82. The Culture of Tobacco. No. 83. Tobacco Soils. No. 84. Experiment Statiui
Work — VII. No. 85. Fish as Food. No. 86. Thirty Poisonous Plants. No. 87. Experiment Statio!
Work — VIII. No. 88. Alkali Lands. No. 89. Cowpeas. No. 91. Potato Diseases and Treatment
No. 92. Experiment Station Work — IX. No. 93. Sugar as Food. No. 94. The Vegetable Garden. No
95. Good Roads for Farmers. No. 96. Raising Sheep for Mutton. No. 97. E.xperiment Statioi
Work — X. No. 98. Suggestions to Southern Farmers. No. 99. Insect Enemies of Shade Trees. No
100. Hog Raising in the South. No. 101. Millets. No. 102. Southern Forage Plants. No. 103. Experi
ment Station Work — XI. No. 104. Notes on Frost. No. 105. Experiment Station Work — XII. No
100. Breeds of Dairy Cattle. No. 107. Experiment Station Work — XIII. No. 108. Saltbushes. No
109. Farmers' Reading Courses. No. 110. Rice Culture in the United States. No. 111. Farmer'
Interest in Good Seed. No. 112. Bread and Bread Making. No. 113. The Apple and How toGrov
It. No. 114. Experiment Station Work — XIV. No. 115. Hop Culture in California. No. 116. Irriga
tion in Fruit Growing. No. 117. Sheep, Hogs, and Horses in the Northwest. No. 118. Grape Grow
ing in the South. No. 119. Experiment Station Work — XV. No. 120. Insects Affecting Tobacco
No. 121. Beans, Peas, and Other Legumes as Food. No. 122. Experiment Station Work— XVI
No. 123. Red Clover Seed. No. 124. Experiment Station Work — XVII. No. 125. Protection of Foo<
Products from Injtirious Temperatures. No. 126. Practical Suggestions for Farm Buildings. No. 127
Important Insecticides. No. 128. Eggs and Their Uses as Food. No. 129. Sweet Potatoes. No. 131
Household Tests for Detection of Oleomargarine and Renovated Butter. No. 132. Insect Enemies o
Growing Wheat. No. 133. Experiment Station Work — XVIII. No.l34. Tree Planting in Rural Schoo
Grounds. No. 135. Sorghum Sirup Manufacture. No. 136. Earth Roads. No. 337. The Angora Goat
No. 138. Irrigation in Field and Garden. No. 139. Emmer: A Grain for the Semiarid Regions. No
140. Pineapple Growing. No. 141. Poultry Raising on the Farm. No. 142. The Nutritive and Economic
Value of P"ood. No. 143. The Conformation of Beef and Dairy Cattle. No 144. Experiment Statioi
Work— XIX. No. 145. Carbon Bisulphid as an Insecticide. No. 140. Insecticides and Fungicides
No. 147. Winter Forage Crops for the South. No. 148. Celery Culture. No. 149. Experiment Statioi
Work — XX. No. 150. Clearing New Land. No. 151. Dairying in the South. No. 152. Scabies ii
Cattle. No. 1.53. Orchard Enemies in the Pacific Northwest. No. 154. The Fruit Garden: Prepara
tion and Care. No. 155. How Insects Afl'eet Health in Rural Districts. No. 156. The Home Vineyard
No. 157. The Propagation of Plants. No. 158. How to Build Small Irrigation Ditches. No. 159. Seal
in Sheep. No. 161. Practical Suggestions for Fruit Growers. No. 162. PLxperiment Station Work-
XXI. No. 164. Rape as a Forage Crop. No. 165. Culture of the Silkworm. No. 106. Cheese Makin;
on the Farm. No. 167. Cassava. No. 168. Pearl Millet. No. 169. Experiment Station Work— XXII
No. 170. Principles of Horse Feeding. No. 171. The Control of the Codling Moth. No. 172. Seal
Insects and Mites on Citrus Trees. No. 173. Primer of Forestry. No. 174. Broom Ctirn. No. 175
Home Manufacture and Use of Unfermented Grape Juice. No. 176. Cranberry Culture. No. 177
Squab Raising. No. 178. Insects Injurious in Cranberry Culture. No. 179. Horseshoeing. No. 18t
Game Laws for 1903. No. 181. Pruning. No. 182. Poultry as Food. No. 183. Meat on the Farm.-
Butchering, curing. No. 184. Marketing Live Stock. No. 185. Beautifying the Home Grounds. Nc
186. Experiment Station Work— XXIII. No. 187. Drainage of Farm Lands. No. 188. Weeds Used ii
Medicine. No. 189. Information Concerning the Mexican Cotton Boll Weevil. No. 190. Experi
ment Station Work— XXIV. No. 191. The Cotton BoUworm. No. 192. Barnyard Manure.

o

Webster Family Library of Veterinary Medfclne
Cummings School of Veterinary Medicine at
Tufts University
200 Westboro Road
Korth Grafton, MA 01 536