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  • Title: Effect of concentration of some dietary amino acids and protein on plasma urea nitrogen concentration in growing kittens.
    Author: Kang MH, Morris JG, Rogers QR.
    Journal: J Nutr; 1987 Oct; 117(10):1689-96. PubMed ID: 3668682.
    Abstract:
    The effect of various levels of leucine, isoleucine, tryptophan, histidine and phenylalanine with and without tyrosine in isonitrogenous purified amino acid-based diets on plasma urea nitrogen (PUN) of growing kittens was examined. In addition, the effect of various levels of nitrogen supplied as amino acids or as a mixture of amino acids and protein on PUN was measured. PUN was not a useful predictor of the concentration of an amino acid that maximized either growth or nitrogen balance. Intake of nitrogen was highly correlated with PUN and accounted for 96% of the variation in PUN.
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