Abstract
Summary
p-Aminobenzoic acid at levels of 5 to 15 mg per 100 g of diet produces growth responses in chicks receiving purified rations low in the unknown vitamins but complete in all other respects. Evidence is given however to suggest that p-aminobenzoic acid is not a specific growth factor for the chick but may act indirectly by stimulating intestinal microarganisms to produce unknown factor(s) essential for the chick. We are indebted to Nerck and Company, Raliway, K.J., for the crystalline vitamins; to Wilson Laboratories, Chicago, Ill., for solubilized Liver (liver fraction L), and whole liver substance; to TT'ilson and Co., Inc., Chicago, Ill., for gelatin; and to Allied Ells, Inc., Peoria, Ill., for soy bean oil. We are grateful to Mr. L. J. Teply and Mr. J. 0. Lampen for the p-aminobenzoic acid assays.
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