Abstract
Data are presented comparing the rate of gain of weanling rats fed various levels of raw or autoclaved soybean oil meal with and without supplementary methionine and penicillin plus streptomycin. Raw soybean oil meal at the 40% level supplemented with either methionine or antibiotics supported the same rate of gain as autoclaved soybean oil meal. The results disprove the hypothesis that raw soybeans contain a “toxic” factor whose effect is enhanced by higher levels of raw soybean intake. The results, rather, support the conclusion that the availability of certain amino acids from raw soybean oil meal is less than that from autoclaved meal or that the requirement for certain amino acids is increased when raw soybean oil meal is fed. Arguments opposing the postulate of availability are reviewed. The postulate of increased requirement is discussed.
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