Effects of Feeding Hexane-Extracts of a Shochu Distillery By-Product on Skeletal Muscle Protein Degradation in Broiler Chicken

  • KAMIZONO Tomomi
    Department of Biochemical Science and Technology, Kagoshima University
  • NAKASHIMA Kazuki
    Molecular Nutrition Research Team, National Institute of Livestock and Grassland Science
  • OHTSUKA Akira
    Department of Biochemical Science and Technology, Kagoshima University
  • HAYASHI Kunioki
    Department of Biochemical Science and Technology, Kagoshima University

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We have found that shochu distillery by-product (SDBP) contains a growth promoting factor that can be extracted with ether. In the present study, we administered hexane-extracts of SDBP (HSDBP) to broiler chickens and observed changes in skeletal muscle protein degradation in order to clarify the mechanism of growth promotion due to SDBP feeding. The pectoralis superficial muscle weight was significantly increased by HSDBP feeding. Plasma Nτ-methylhistidine concentration was significantly decreased by HSDBP, showing that the rate of muscle protein degradation decreased. It was also found that the expression of mRNA of ubiquitin-proteasome system and calpain was decreased by HSDBP. These results indicate that growth promotion due to SDBP is caused by suppression of skeletal muscle protein degradation, which is related to the ubiquitin-ptoteasome system and calpain.

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