THE INFLUENCE OF ENVIRONMENTAL TEMPERATURE ON DIETARY REQUIREMENT FOR THIAMINE, PYRIDOXINE, NICOTINIC ACID, FOLIC ACID AND CHOLINE IN CHICKS

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Abstract
Studies with chicks on all-synthetic diets verified the authors'' previous findings on white rats of a heightened thiamine requirement in environments of tropical moist warmth. Diets adequate for optimal growth in temp. coolness (70[degree]F) are definitely deficient for chicks kept at 90[degree]F with 70% relative humidity. The polyneuritis threshold for the chicks was found at 1 mg. of thiamine/kg. of diet at 70% and at 2 mg./ kg. in the heat. No such differences in dietary requirement in the heat and cold were found for pyridoxine, nicotinic acid, folic acid, or choline.