Abstract
The requirements of pantothenic acid, folic acid, biotin and vitamin B_<12> for the maximum growth of White Leghorn male chicks in Japan were observed to be not more than the requirements recommended by National Research Council, U.S.A., that is 9.3,0.55,0.088 and 0.0088 mg/kg, respectively, while the requirements of thiamine, nicotinic acid and choline were significantly higher than those recommended in U.S.A., i.e.1.8,26.5 and 1,320 mg/kg, respectively. Riboflavin requirement of our chicks was between 4.5-5.5 mg/kg, which is 1.5-2.0 times more than that recommended in U.S.A. With riboflavin supplementation of 2.9 mg/kg, the amount recommended in U.S.A., typical curled-toe paralysis was observ d, indicating that chicks in this country need more riboflavin than those in U.S.A. This finding with riboflavin is similar to that with pyridoxine reported previously.
