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The Synthesis of B Vitamins in the Horse

University of California¹

Abstract

INFORMATION about the nutrition of the horse is not as complete as that for other farm animals. This is particularly true concerning the need for members of the B complex in the horse's diet. One of the first reports indicating that horses required vitamin B was that of Naito et al. (1925). When a diet of polished rice and rice straw supplemented with cod liver oil and minerals was fed to horses they lost weight and developed symptoms characteristic of thiamin deficiency. Carlström and Hjätrre (1939) reported that several military horses in a Swedish regiment, receiving very poor quality hay and grain, became emaciated, developed anorexia, and incoordination. The blood contained above normal amounts of pyruvic acid, lactic acid, bisulfite combining substances, and acetone. When 250 grams of dried yeast was fed daily to each animal, the blood picture became normal and the horses, in general, improved rapidly. These authors proposed that 50 grams of dried yeast and 50 grams of chalk be supplied per animal per day when hay and grain are of poor quality.

¹ Division of Animal Husbandry, Davis, California.