To delay the onset of fatigue, endurance horses are often fed at rest stops during races. The resulting increase in blood insulin may adversely inhibit lipolysis. In humans, ingestion of fructose produces a smaller insulin rise than glucose. This study compared glucose and fructose as carbohydrate supplements for endurance horses.

It has not been clearly established whether exercise affects digestibility. Therefore, it was the purpose of this study to measure the effect of 8 km daily trotting and galloping exercise on the digestibility and rate of passage of either an all-forage or a mixed forage/grain ration in trained Thoroughbred horses.

Vitamin A influences growth and reproduction in horses. A retinol dose response (RDR) test for retinol has been shown to be better than serum retinol concentration for assessing vitamin A status in other species, so we have compared these two methods in the horse.