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Utilization of Nitrogen from Selected Purines and Pyrimidines and from Urea by the Young Chick

Department of Animal Science, University of Illinois, Urbana 61801

Young chicks were fed crystalline amino acid diets made first-limiting in nonessential nitrogen (i.e., glutamic acid). Addition of 3% L-glutamic acid to this diet doubled growth rate. Urea supplementation stimulated growth, even in the presence of a high dietary level of chlortetracycline. Adenine at levels below 0.60% stumulated weight gain and protein retention. Growth was depressed by adenine levels greater than 0.80%, but a high level of chlortetracycline tended to ameliorate this effect. Uracil appeared to be a good source of nitrogen for nonessential amino acid synthesis but neither xanthine nor uric acid elicited a response when added to the nitrogen-deficient diet.

KEY WORDS: • nucleic acid • adenine • xanthine • uric acid • urea • uracil • chlortetracycline

¹ Present address: Department of Poultry Science, Cornell University, Ithaca, N. Y. 14850.

Manuscript received 27 August 1973.