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The B Vitamin Requirements of the Horse

Agricultural and Mechanical College of Texas¹

Abstract

Investigations were made using Shetland ponies to determine if a source of the B vitamins is required for Equidae. Rations made up of beet pulp, corn, purified casein, salts, and vitamins A and D failed to support growth. When 10 per cent of yeast was added to such a ration, horses made satisfactory gains. Five per cent of yeast was not adequate to support growth. Rice straw was found to be a fairly good source of riboflavin and pantothenic acid, and its addition to the ration promoted satisfactory gains.

Suppelementing the basal ration with synthetic riboflavin and pantothenic acid resulted in essentially as good growth as including 10 per cent of yeast in the ration. A ration containing 0.35 mg. of riboflavin per 100 grams was adequate for the normal growth of the horses under the experimental conditions described. This is equivalent to an intake of approximately 44 mg. of riboflavin per kilogram of body weight per day.

¹ Nutrition Laboratory, Department of Animal Husbandry, and the Division of Veterinary Science, Agricultural Experiment Station, College Station, Texas.

The authors are indebted to Merck & Company for a generous supply of the synthetic vitamins, and to Anheuser-Busch Inc., for the brewers yeast used in these investigations.