The Rate of Incorporation and Degradation of Phenylalanine-<sup>14</sup>C by Tissue Slices of Roosters Fed a Phenylalanine-free Diet

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  • フェニルアラニン欠乏飼料を給与した成鶏の組織切片によるフェニルアラニン-<sup>14</sup>Cのとりこみと分解速度
  • フェニルアラニン ケツボウ シリョウ オ キュウヨシタ セイケイ ノ ソシキ

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To investigate the reason why adult roosters maintain nitrogen equilibrium on a phenylalanine-free diet for long periods, the rates of incorporation and of degradation of phenylalanine-, tyrosine- and isoleucine-14C by tissue slices of roosters on the control, phenylalanine-free or isoleucine-free diets were measured. The degradation rate of isoleucine by liver and muscle slices decreased significantly for the isoleucine-free diet. However, the degradation rate of phenylalanine-14C by liver slices for the phenylalanine-free diet was not significantly lower than that for the control diet in contrast to the previous observation in vivo. The incorporation rates of 14C into liver and muscle proteins were not affected by the dietary conditions in this experiment except in the case of phenylalanine-14C by muscle slices for the phenylalaninefree diet.

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