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Journal of Nutrition Vol. 75 No. 3 November 1961, pp. 330-334
Copyright © 1961 by American Society for Nutrition
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Counteraction of the Growth Depression of Raw Soybean Oil Meal by Amino Acid Supplements in Weanling Rats1

Raymond Borchers

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

Raw soybean oil meal, when fed to weanling rats at a 12% protein level as the sole source of amino acids, supported a growth rate less than that observed with the use of heated soybean oil meal. Supplementing the ration with methionine, threonine, and valine resulted in an increased growth rate with the raw soybean oil meal ration. With 8 of the 11 soybean samples, this supplement supported growth rates which were similar for raw and heated rations. With three of the 11 samples, a supplement of 8 essential amino acids supported similar growth rates. The results are interpreted as an indication that the feeding of raw soybean oil meal causes an increased apparent dietary requirement for amino acids. Possible mechanisms for such an increased requirement are pointed out. The case against decreased availability of amino acids from raw soybeans is reviewed.

1 Published with the approval of the Director as paper no. 1117, Journal Series, Nebraska Agricultural Experiment Station. A preliminary report was given at the meeting of the American Institute of Nutrition, Atlantic City, 1959 (Federation Proc., 18: 517). Supported in part by research grant A-2018 from the National Institute of Arthritis and Metabolic Diseases of the National Institutes of Health, U. S. Public Health Service.

Manuscript received 19 June 1961.




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