Diurnal Rhythm and Time Course Change of Plasma Amino Acid Concentration after Fasting and Refeeding in Broiler Chicks

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  • UENO Keisuke
    Graduate School of Science and Technology, Niigata University
  • ISHIBASHI Teru
    Graduate School of Science and Technology, Niigata University

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  • ブロイラーにおける血漿アミノ酸濃度の日内変動および 絶食および再給餌後の経時的変化
  • Diurnal Rhythm and Time Course Change o

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Abstract

The diurnal rhythm of plasma concentration (PC) of amino acid (AA) and the effects of fasting and refeeding on the PC of AA were studied using female broiler chicks. At 22 days of age, blood samples were taken alternately at 5:00, 10:00, 15:00, 19:00 and 23:00 from three groups of four broilers given free access to the stock diet. On the second day of the experiment, chicks were fed the diet from 5:00 to 7:00, and blood samples were taken at 0, 3, 8, 12, 16, 27 and 32h after the removal of troughs at 7:00 from three groups alternately. The chicks fasted for 27h were refed the stock diet and blood samples were taken at 0, 5, 24, 48, 72 and 96h after refeeding. When the chicks were fed ad libitum, the diurnal rhythm of the PC of AA classified into three types were observed. The PC of seven out of 16 AA determined had two peaks at 10:00 and 19:00. Those of eight AA increased and then decreased gradually and that of lysine increased slightly from 5:00 to 23:00. After fasting, the PC of all the detected AA except four AA, decreased for the first three hours, and then increased to constant levels. Those of cystine, glutamic acid and glycine continued to decrease and that of lysine continued to increase linearly until 32h after fasting. After refeeding at 27h after fasting, the PC of all AA except isoleucine and lysine increased sharply until 6h and reached a plateau by 72h after refeeding. Those of isoleucine and lysine decreased and reached a constant level by 6h after refeeding. From these results, it was suggested that the PC of some AA responded quickly to the drastic dietary changes, fasting and refeeding, but the range of fluctuation of PC of AA due to diurnal rhythm and changes of dietary condition were different among AA.

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