This section is from the book "Stable Management And Exercise", by M. Horace Hayes. Also available from Amazon: Stable Management And Exercise.
Oats - Maize - Barley - Dried Brewers' Grains - Wheat - Bran - Linseed - Beans and Peas - Millet - Rice - Rice Meal - Rye - Cocoanut Meal - Potatoes - Roots, Fruit, Gourds, and Sugarcane - Indian Pulses - Cows' Milk - Grass, Hay and Straw - Lucerne - Bamboo Leaves - Condiments, etc.
Horses are fed on rye (Secale cereale) to some extent in Northern Europe; but even in Russia, where it forms the staple food of the peasants, it is considered to be much inferior to oats as an article of fodder. It is, I believe, generally given in a coarsely ground state, moistened with water, and mixed with chop. I have often heard that it is not safe to give more than 5 lb. of rye daily to a horse.
According to experiments made in the French army, cocoa-nut meal proves an efficient substitute for oats. It is the residue in the manufacture of cocoanut oil, and has nearly the same composition as dried brewers' grains.
Raw potatoes given to horses are very apt to disagree with them. In fact, many experienced veterinary surgeons are of opinion that they have a poisonous effect on these animals.
Steamed potatoes mashed up and mixed with chop are probably the least objectionable form in which these tubers can be given. Even then, like other kinds of boiled food, they cause undue distension of the stomach and intestines of horses fed on them for a long period. The nutritive value of hay has been estimated at about three times that of potatoes.
 
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