Slow feeding is best for your horse.
Horses at pasture eat as nature intended. Grazing alleviates boredom, which helps prevent behaviors like cribbing and weaving. Saliva from near-constant chewing contains bicarbonate that buffers the acid in equine stomachs. The constant feed source helps horses stay more relaxed overall, as they suffer less digestive discomfort and aren’t obsessing over food between feedings. If pasture isn’t an option for your horse, consider multiple small feedings daily, free-choice grass hay, or a method of slowing his eating and extending feed times.
Pasture turnout accommodates a horse’s “trickle feeding” nature—eat a little, walk a little, socialize a little.