This section is from the book "The Stable Book: Being A Treatise On The Management Of Horses", by John Stewart. Also available from Amazon: The Stable Book.
In the stable a horse's food can be given in measure proportioned to his wants. But at pasture he may get too much, or he may get too little. This is a strong objection "to summering hunters in the field. It is difficult to put the horse where he will receive all the nourishment he requires, and no more. In a rich pasture he may acquire an inconvenient load of fat; in a poor one he may be half starved. If he must go out, he may be taken in before he becomes too fat, or he may be placed in a bare pasture, and fed up to the point required, by a daily allowance of grain.
In winter, few pastures afford sufficient nourishment to a horse that must go to work in spring. A little hay is given, but in many cases some grain should be added. The horse will pay for it when he goes into work. His condition, however, will tell what is wanted. He had better be rather lean than too fat when he commences work, especially if the work be fast.
 
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