Question: how much grain does a horse eat per day?
Answer: DON'T feed more than 11 pounds of grain per day, or 4-5 pounds of grain per feeding, or the horse's colic risk increases sixfold. DON'T worry about too much protein making a horse hot. Only 10% of the horse's energy comes from protein, so it is a very insignificant source. DON'T feed supplements unless they are needed.