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Supplementary Methionine Requirement of Weanling Rats Fed Soybean Oil Meal Rations¹

Department of Biochemistry and Nutrition, University of Nebraska, Lincoln, Nebraska

The supplementary requirement for L-methionine by weanling rats fed heated soybean oil meal rations containing 12% of soybean protein has been found to be 0.15% of the ration. The requirement was observed to be 0.19% when the rations contained raw soybean oil meal or raw meal plus a supplement of penicillin plus streptomycin or of 7 essential amino acids. The increased requirement for methionine when raw soybean oil meal was fed represents an increase of 8% (assuming a cystine plus methionine requirement of 0.50%) over the requirement when heated soybean oil meal was fed.

Manuscript received 23 February 1962.