Answer :
Small intestine is the primary gastrointestinal tract location where protein, starch and fat is digested in pigs and horse. Large intestine is the primary GI tract location where fiber is digested in pigs and horse . But rumen is the tract where protein, fiber, starch and fat are digested in for cows.
A horse's needs for energy, protein, vitamins, and minerals are the same as those of other animals, but it has a different sort of digestive system that falls between ruminants and non-ruminants. Humans, pigs, and dogs are non-ruminants, and they digest carbs, protein, and fat by enzymatic action. Ruminants (cattle, sheep, and deer) use enzymatic digestion in the small intestines and bacteria in the fore stomachs to ferment cellulose.
Enzymatic digestion is used for all actual digestion in horses, and it happens in the foregut before the cecum. This is responsible for nearly all of the soluble carbohydrate digestion and 52–58% of the crude protein digestion (fiber excluded). The cecum and colon also undergo bacterial or microbial digestion of fiber, resulting in a significant production of volatile fatty acids that are thereafter absorbed.
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