Ulcers are a man-made disease, affecting up to 90 percent of racehorses and 60 percent of show horses.
Stall confinement alone can lead to the development of ulcers. A horse’s feeding schedule also can be a factor. When horses are fed just twice a day, the stomach is subjected to a prolonged period without feed to neutralize its naturally produced acid.
In addition, high-grain diets produce volatile fatty acids that can also contribute to the development of ulcers.
Stress, both environmental and physical, can increase the likelihood of ulcers, as can hauling, training and mixing groups of horses. Strenuous exercise can decrease the emptying of the stomach and the blood flow to the stomach, thus contributing to the problem.