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: Copyright © . .