Effects of Orally Administrated Amino Acids on Myofibrillar Proteolysis in Chicks

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  • NAKASHIMA Kazuki
    Department of Animal Physiology and Nutrition, National Institute of Livestock and Grassland Science
  • ISHIDA Aiko
    Department of Animal Physiology and Nutrition, National Institute of Livestock and Grassland Science
  • YAKABE Yoko
    Department of Animal Physiology and Nutrition, National Institute of Livestock and Grassland Science
  • YAMAZAKI Makoto
    Department of Animal Physiology and Nutrition, National Institute of Livestock and Grassland Science
  • ABE Hiroyuki
    Department of Animal Physiology and Nutrition, National Institute of Livestock and Grassland Science

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Abstract

We examined the effects of orally administrated amino acids on myfibrillar proteolysis in food-deprived chicks. Plasma Nτ-methylhistidine concentration, as an index of myofibrillar proteolysis, was decreased by the administration of Glu, Gly, Ala, Leu, Ile, Ser, Thr, Met, Trp, Asn, Gln, Pro, Lys and Arg but not by Asp, Val, Phe, Tyr or His to chicks. Orally administrated Cys was fatal to chicks. These results indicate that oral Glu, Gly, Ala, Leu, Ile, Ser, Thr, Met, Trp, Asn, Gln, Pro, Lys and Arg administration suppressed myofibrillar proteolysis in chicks.

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