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Journal of Nutrition Vol. 19 No. 3 March 1940, pp. 271-283
Copyright © 1940 by American Society for Nutrition
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The Independence of the Endogenous and the Exogenous Metabolism of Nitrogen1

E. Wise Burroughs, Helen S. Burroughs and H. H. Mitchell

Division of Animal Nutrition, University of Illinois, Urbana

Although thirteen individual amino acids, including all of those considered essential for growth, four amino-acid mixtures, including one that proved adequate for the maintenance of nitrogen equilibrium in the adult rat, and one complete protein mixture of high biological value (egg) were tested, no evidence was obtained that the endogenous metabolism could be depressed by such nitrogen-containing supplements.

The independence of the endogenous and exogenous types of nitrogen metabolism is thus confirmed.

1 The substance of this paper was taken from a thesis submitted by E. Wise Burroughs to the Graduate School of the University of Illinois in partial fulfillment of the requirements of the degree of Doctor of Philosophy in Animal Husbandry, July, 1939.

Manuscript received 7 December 1939.




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