Forage: Evaluating Quality and Balancing Rations

Basing a horse’s diet on forage allows him to function as evolution and nature intended. Here’s where to start.
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It’s rare to look at a barn’s feeding chart and see that every equine resident is consuming the same exact diet. The lean sport horse in heavy work in Stall 1 will probably need more calories than the lower-level lesson horse in good body condition in Stall 2. And the fat pony trying to escape from Stall 3 sure won’t need the same ration as the nearly toothless retiree napping in Stall 4. But one thing all these equids need in their diets is forage—the pasture and hay that should make up most of their ration.

At the 2015 American College of Veterinary Internal Medicine Forum, held in June in Indianapolis, Megan Shepherd, DVM, PhD, Dipl. ACVN, presented a review of forage quality and how to balance horses’ diets around the forage they’re receiving.

“Horses generally consume water, forage, concentrates, and supplements—and by supplements I am referring to vitamins and minerals as I will not address nutraceuticals,” said Shepherd, a clinical assistant professor of clinical nutrition at the Virginia-Maryland College of Veterinary Medicine Department of Large Animal Clinical Sciences, in Blacksburg, Virginia. “Water is always the most important ingredient in a horse’s ration. Forage is the next most important, to which everything else in the ration should be based.”

It all boils down to evolution. Shepherd explained that horses evolved consuming forage—a good source of both energy and carbohydrates (especially fiber, she said)—and still thrive on forage-based diets because of how their digestive tracts function. Of specific importance are horses’ hindgut (cecum and colon) microbes

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Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.

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