The stomach
The horse's stomach is small in relation to the body and produces stomach acid around the clock. That suits an animal that eats small amounts all day long.
General information, not individual feeding or ration advice. For your own horse, consult your vet or a nutritionist.
How does it work?
The stomach is small and makes up only about a tenth of the digestive tract, with a capacity of roughly 8 to 15 litres. It secretes stomach acid continuously, day and night, even when empty. The stomach has two parts: a lower, glandular part that protects itself with mucus, and an upper part without that protection, which is more sensitive to acid. Almost constant small amounts of roughage keep the stomach occupied and buffer the acid.
Why it matters
Because acid is always being produced, a long empty period is a strain on the stomach. Fibre-rich feed and saliva keep the acid in check, which explains why roughage is so important for stomach health.
Common misconceptions
- The stomach does not only produce acid while eating; that happens all day long.
- A horse cannot readily handle large meals the way a human can; the small stomach is built for small, frequent portions.
What to watch for
Long periods without feed expose especially the unprotected upper part of the stomach to acid and are linked to gastric ulcers (EGUS). This is a referral, not treatment: if stomach problems are suspected, the vet is the right source.
Discover more
Sources: Ohio State University Extension · Merck Veterinary Manual · UC Davis Center for Equine Health.