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A Study of the Nitrogen Metabolism of Lysine-Deficient Rats1

James W. Bothwell, John R. Prigmore2 and J. N. Williams, Jr.

Department of Biochemistry, University of Wisconsin, Madison

The effects of a lysine deficiency upon nitrogen balance and nitrogen components of the blood and urine have been investigated employing both ad libitum and force-feeding procedures. Under force-feeding conditions a marked increase was noted in urinary nitrogen for animals receiving a lysine-deficient ration. The extra nitrogen was identified as almost entirely urea. As in previous studies, a positive nitrogen balance was obtained throughout the experiment for animals force-fed the lysine-deficient ration. Blood nitrogen could not account for this retained nitrogen. Uremia could not account for the death of the animals from a lysine deficiency as shown by measurement of various nitrogen components as well as the total nitrogen of the blood.

1 Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. Supported in part by a grant from the Nutrition Foundation, Inc., New York, and by a contract between the Regents of the University of Wisconsin and the Office of Naval Research, Washington, D. C.

2 Captain in U.S.A.F. (M. S.); sponsored by U.S.A.F. Institute of Technology.

Manuscript received 24 June 1954.




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Copyright © 1954 by American Society for Nutrition