06/04/2026
Your horse gets up to 70% of its energy from fiber fermentation. Not grain. Not supplements. Fiber.
Understanding how the horse converts feed into usable energy is one of the most practical things an owner can know - because it changes how you read both the feed bag and the horse.
Horses have three main fuel sources:
Fiber. Fermented by billions of microbes in the hindgut, producing volatile fatty acids that deliver steady, sustained energy for hours. This is the foundation of everything.
Fat. A dense, calm energy source processed in the small intestine, then sent to the liver and available as needed for muscle function. Fat delivers 2.25 times more energy per gram than starch - with zero insulin impact.
Starch. Quick energy from grains, but with a risk. When starch overloads the small intestine, the excess spills into the hindgut, disrupting the microbial population. That disruption is where acidosis, colic risk, and laminitis begin.
The horse that feels hot, reactive, or inconsistent is often a horse whose fuel balance is off - too much starch, not enough fiber and fat to steady the system underneath.
Share this with someone who's been told their horse just needs more work.
Follow along for friendly, expert equine nutrition advice and insights.