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B Vitamin Content in the Skeletal Muscle of the Horse Fed A B Vitamin-Low Diet

University of California¹

Abstract

A Percheron filly, weighting 1325 pounds, was used in this experiment. She had been on a B vitamin-low diet for 32 weeks, the last 12 weeks of which she received an average daily supplement of 30 mg. of thiamin hydrochloride. This filly was slaughtered and the B vitamin content of the gluteus medius muscle was compared with a composite gluteus medius muscle sample obtained from is horses receiving normal feed. In addition, samples from the caecal and rectal contents of the filly were analyzed to determine whether B vitamins were being synthesized. The conclusions are:

1. Synthesis of riboflavin, pantothenic acid, nicotinic acid, pyridoxine, biotin, and folic acid was observed in the alimentary tract of the filly receiving a B vitamin-low diet plus thiamin. The data did not indicate synthesis of inositol.
   
2. The gluteus medius muscle of the filly contained noticeably less riboflavin, pantothenic acid, nicotinic acid, biotin, and folic acid than the composite sample. Though these five vitamins were being synthesized, their absorption was insufficient to maintain the muscle level at that found in horses on normal feed. There was no evidence of inadequate absorption of pyridoxine and inositol.
   
3. An average daily intake of 30 mg. of thiamin hydrochloride—about 2.5 mg. per 100 pounds body weight—was sufficient to prevent depletion of this vitamin in the skeletal muscle.
   

¹ Division of Animal Husbandry.