RETENTION OF THE NITROGEN OF AMINO ACIDS ADMINISTERED SINGLY OR IN MIXTURES TO DOGS FED DIETS LOW IN PROTEIN

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Abstract
A portion of the N of each of a number of amino acids, of creatine and of urea, administered to dogs fed on diets lacking protein, has on occasion been retained, but with most of the compounds the bulk of the N was promptly rejected. Cystine, histidine and lysine appeared exceptional; expts. with them suggested selective retention of N. Mixtures of histidine, isoleucine, leucine, lysine, phenylalanine, tryptophane and valine together with cystine or methionine or both, have been administered to dogs fed on diets low in protein, in amts. to supply N equal to less than half of the urinary N. The N was retained completely or spared equivalent amts. of tissue N.

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