Horse Digestive Health: Welfare Through Evidence-Based Feeding Management

Digestive health is foundational to horse welfare, and feeding management decisions that support gut function prevent significant suffering.

Key Facts

Horses evolved to graze for 16-18 hours daily — their digestive system is adapted for continuous small forage intake
Gastric acid is produced continuously regardless of whether food is present — periods without forage allow acid to damage the stomach lining
Colic is a leading cause of death in horses and has multiple digestive causes including impaction, displacement, and volvulus
Large bowel impactions are associated with dehydration, low-roughage diets, and sudden dietary change
High-starch cereal-based diets are associated with hindgut acidosis, laminitis, and behavioral changes
Horses should receive at least 1.5% of body weight in forage daily as a minimum welfare provision
Slow-feeders and multiple hay stations extend feeding time and reduce the welfare impacts of restricted grazing
Sudden dietary changes are a major colic risk — all feed changes should be made gradually over 7-14 days

Welfare Considerations

Equine digestive health is not a management nicety but a welfare imperative. The horse digestive system is finely tuned to a near-continuous intake of fibrous forage, and managing horses in ways that deviate significantly from this — restricted feeding, high-grain diets, inconsistent feeding schedules, sudden feed changes — causes both acute and chronic welfare problems. Colic is a genuine emergency causing acute suffering; chronic gastric ulcers cause persistent discomfort that affects every aspect of a horse life. Feeding management decisions are welfare decisions, and owners and yard managers who understand equine digestive physiology are better equipped to prevent the most common and avoidable sources of equine suffering.

What You Can Do

Provide constant or near-constant forage access — use slow feeders and multiple hay stations if needed
Feed at least 1.5% of body weight in quality forage daily regardless of concentrate levels
Make all dietary changes gradually over 7-14 days minimum to prevent digestive disturbance
Minimize periods without forage — never leave horses without hay or grazing for more than 4-6 hours
Reduce high-starch concentrate diets and substitute fat and fiber for energy where possible
Ensure consistent access to fresh water at all times — dehydration dramatically increases colic risk
Know the signs of colic and have your vet contact information ready — time is critical in surgical emergencies