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Photo courtesy of Uckele Nutrition
Photo courtesy of Uckele Nutrition

by Eleanor Kellon, VMD

Both owners and professionals seem to fall into two groups, those who espouse forage only (hay, pasture) and those who focus on the commercial grain they feed. Both are wrong.

FOUNDATION OF EVERY HORSE'S DIET

It's true that the foundation of every horse's diet should be forage. The more work the horse does, the more calories they need and horses doing very physically demanding work often cannot get all the carbohydrates they need to maintain muscle glucose stores (glycogen) with forage alone. That is where concentrated carbohydrate sources come in. However, no horse needs grain for anything else.

WHAT IS HAY

Hay is simply dried grass. It has lower calories and lower carbohydrates than live grass because it continues to metabolize those until water reaches a critical low level and stops enzyme activity.

HAY'S PROTEIN

Hay is the horse's major source of protein. Good quality grass hay contains 8 to 12% protein yielding 362 to 545 grams of protein in 10 pounds. In contrast, 5 lbs of a 10% protein grain has 227 grams. Forage is the major source of protein.

HAY'S VITAMINS

When hay is cured, it rapidly loses vitamins C, E and, over time, the vitamin A precursor carotene. However, it is an excellent source of vitamin D and all the B vitamins are preserved in their biologically activated form.

HAY'S FAT

There is no dietary requirement for fat other than the essential fatty acids which the body cannot manufacture. This hasn't been studied in horses but in other species, alpha-linoleic and linolenic acid, omega-6, and omega-3. Live grass is a rich supply of both but cured hay loses its omega-3 and this needs to be replaced with flax or Chia seed. Grains and all the common vegetable oils are low in omega-3 and high in omega-6.

HAY'S ESSENTIAL MINERALS

Hay or grass contains all the nutritionally essential minerals, although not necessarily in the correct minimum amounts or ratios. Grains are not inherently balanced either but manufacturers can add what is needed to help meet minimum levels. What they cannot do is correct imbalances in the hay and for most horses that leaves the bulk of the diet unbalanced.

HAY ANALYSIS

Hay analysis is the ideal way to find out what needs to be added to the diet to balance hay. You can also reach out to your local agricultural extension agent or the state agriculture department to get average figures for where the hay was grown.

CONCLUSION

If horses were still roaming over hundreds of miles eating a wide variety of vegetation we wouldn't have to consider the imbalances created by the exact same diet for months or even years. It takes a little effort to get the diet maximized but well worth the effort.

This article originally appeared on Uckele Nutrition and is published here with permission.

There are lots of good articles in our section on Health & Education.

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