Phenylalanine Requirement of the Growing Chick

1973 Nippon Nogeikagaku-kaishi  
A series of experiments was conducted to reevaluate the phenylalanine requirement of the growing chick fed an amino acid diet containing 20% of amino acid mixture for 10 days from the 7th to 17 th day. The effect of varying the level of phenylalanine and tyrosine in the diet on plasma free phenylalanine and other amino acids and the oxida tion of phenylalanine were also studied. When the diet contained 0 and 0.63% tyrosine, the caluculated phenylalanine require ments from the daily body weight
more » ... daily body weight gain for 10 days were 109 which was equivalent to 0.83% of phenylalanine and 56 mg/chick/day, respectively, and tyrosine could supply 49% of phenylalanine. When phenylalanine was limiting amino acid in the diet, phenylalanine did not accumulate in the plasma of 17-day-old chicks. However, it accumulated in a linear manner when the consumption of phenylalanine was moderately in excess of that re quired to maximize growth. The calculated requirement levels were 84 and 45mg/chick/ day, respectively, when the diet contained 0 and 0.63% tyrosine. The recovery % of 14C in respiratory CO2 was less than 0.4% of injected dose of DL
doi:10.1271/nogeikagaku1924.47.153 fatcat:ujp7eyems5cobpzg66buds3bau