The horse is a single-stomached animal that shares with the ruminants (cattle, sheep and deer) the ability to digest fibrous plant materials. The stomach is small, and the fermentation chamber is in the hind guts. The horse is thus classified as a hind gut fermenter. Some basic information on the physiology of the equine digestive system is given in  the table below.

Length, volume and passage time through different parts of the digestive tract of a 500 kg horse

*Normal volume about 1/3 of maximal capacity