肥育ステージの異なるホルスタイン種去勢牛における皮下脂肪細胞の大きさと脂肪合成能との関連

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タイトル別名
  • The Relationship Between Lipogenic Activity and the Size of Adipocytes from Subcutaneous Adipose Tissue of Holstein Steers During the Fattening Period
  • Relationship Between Lipogenic Activity

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抄録

Isolated adipocytes were used to evaluate the lipogenic activity in subcutaneous adipose tissue of Holstein steers during various fattening periods. During the fattening period, both the mean diameter of adipocytes and the lipogenesis increased continually. There was a positive correlation between the mean diameter of adipocytes and the lipogenesis from glucose (r =0.74, P<0.05) or from acetate (r=0.81, P<0.05). Further, the relationship between the size of adipocyte and the lipogenic activity was investigated. It can be done through measuring the incorporation rate of substrates into lipids in each fraction of adipocytes which were separated by meshes. It was shown that both the incorporation rate of glucose or acetate into lipids and the relative contribution ratio of incorporation rate of acetate to glucose in the adipocytes taken from finishing steers, were significantly larger (P<0.05) than those from the early fattening steers. In the adipocytes which were taken from early fattening steers, the incorporation rate of glucose or acetate into lipids became larger with increment of the mean diameter from fraction 1 (33μm) to fraction 6 (139μm) (both: r=0.72, P<0.05). In the adipocytes which were taken from finishing fattening steers, the incorporation rate of glucose into lipids increased with the increment of the mean diameter from fraction 1 (36μm) to fraction 6 (164μm) (r=0.79, P<0.05), while the incorporation rate of acetate into lipids increased only with increment of the mean diameter from fraction 1 (36μm) to fraction 4 (116μm), then decreased with the increment of the mean diameter from fraction 4( 116μm) to those very large adipocytes in fraction 6 (164μm).

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 69 (5), 424-432, 1998

    公益社団法人 日本畜産学会

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