Myofiber Type Distribution in the Cranial Portion of M. biceps femoris of Japanese Black Young Steers

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概要

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• Histochemical properties of M. biceps femoris were examined in Japanese Black young steers (11 months of age). The cranial portion of M. biceps femoris was dissected out from M. gluteobiceps after measuring its weight and was divided into 3 parts of equal length, namely the proximal, middle and distal. At the center of each part, the muscles were collected from the 5 subparts of equal depth from the superficial to the profound. Using the histochemical reactions for myosin ATPase and reduced nicotinamide adenine dinucleotide dehydrogenase, myofibers were categorized into Type I, Type II A and Type II B4). Different distributions of myofiber types among the parts were also recognized in these young steers showing the same tendency as in the fattened adult in our previous study7). However, Type II A myofibers occurred at higher percentage in the young than in the adult in every parts and Type I and Type II B showed the reverse tendency except for Type II B in the proximal part. These results indicated that the biceps muscle underwent a change in the myofiber type composition with transformation of Type II A to Type I and Type II B from 11 to 29 months of age.

• 社団法人 日本畜産学会の論文

著者

• Ono Yoshitaka

  Kuju Agricultural Research Center Kyushu University

• IWAMOTO Hisao

  Graduate school of Bioresource and Bioenvironmental Science, Kyushu University

• Gotoh Takafumi

  Graduate School Kuju Agricultural Research Center Faculty Of Agriculture Kyushu University

• Nakanishi Yoshitaka

  Kuju Agricultural Research Center Faculty Of Agriculture Kyushu University

• GOTOH Takafumi

  Graduate school of Bioresource and Bioenvironmental Science, Kyushu University

• UMETSU Raizaburo

  Faculty of Agriculture, Kagoshima University

• ONO Yoshitaka

  Kuju Agricultural Research Center, Kyushu University

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