梅山豚の成長にともなう枝肉構成の変化  [in Japanese] The Changes of Carcass Composition in Meishan Pigs During Their Growth  [in Japanese]

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Abstract

梅山豚 (M) の枝肉構成が, 30, 60, 90kgの屠殺時体重によってどのように変化するかをランドレース種 (L) とデュロック種 (D) を対照にして比較検討した。供試豚としてM27頭, L15頭, D16頭の去勢雄を使用した。<br>屠体長の体重の増加にともなう増加量はMがD, Lより小さかったが, 屠体幅ではMがD, Lより大きかった。背脂肪の厚さはM%gt;L>Dの順となり, LとDは成長とともに徐々に増加したが, Mは30~60kgの間に急激に増加し, 成長にともなってMとL, Dとの差が大きくなった。ロース断面積はMがD, Lより小さい上に増加量も少なかった。<br>枝肉歩留り (%) では, 各屠殺時でMが他の2品種より低かったが, 発育にともなう変化量には品種間で大きな差は認められなかった。枝肉構成の変化ではMはD, Lに比べ30kgでは前躯割合が高く, 後躯割合が低く, 中躯割合は同等であった。30~60kgでMは他の品種より中躯割合が増加した。<br>枝肉の赤肉割合は, 発育にともなってMが他の2品種より急激に減少し, 逆に脂肪割合は急激に増加した。骨の割合では各屠殺時体重とも, D>M>Lの順で梅山豚特有の傾向は認あられなっかった。また, 枝肉の全赤肉量に占める各種筋肉の割合では, 経済価値の高い胸最長筋でDとLは発育にともない増加の傾向を示したが, Mでは減少した。<br>以上のような枝肉構成の変化から判断すると, Mの出荷適期は60kg以下であると考えられた。

In order to investigate the changes of carcass composition in Meishan pigs during their growth, five, five and 17 barrows were slaughtered at their live weights of 30, 60 and 90kg, respectively. Each five or six barrows of two control breeds (Landrace and Duroc) were also slaughtered at the same body weights.<br>The carcass length increased in Meishan less than in the control breeds with increasing body weight, but Meishan showed bigger gain of the carcass width than the control breeds. The backfat thickness in Meishan increased rapidly from 30 to 60kg of body weight and the differences of the backfat thickness between Meishan and the other breeds became larger with increasing body weight. The loin eye area in Meishan increased less than in the control breeds and Meishan showed only minor changes from 60 to 90kg of live weight.<br>The carcass yield (in percentage) in Meishan was lower than in the control breeds at each body weights, but the changes of Meishan with growth was similar to those of the control breeds. Meishan showed higher percentage for the ratio of the fore part of the body and lower value for the ratio of the hind part than the control breeds and similar value for the ratio of the middle part to the contorol breeds at 30kg. The ratio of the fore part decreased and that of the middle part increased in Meishan more than in the control breeds from 30 to 60kg.<br>As for the ratios of lean, fat and bone relative to the carcass weight, Meishan decreased the ratio of muscle by 27.7 percentage units from 60 to 90kg of weight, whereas Landrace and Duroc decreased the ratios by only 7.4 and 2.5 percentage units, respectively. In contrast, Meishan increased the raio of fat by 34.9 percentage units from 30 to 90kg of body weight, whereas Landrace and Duroc increased by 5.4 and 11.1 percentage units, respectively. The raios of bone were in order Duroc>Meishan>Landrace at each body weights. Although control breeds showed no decrease in the ratio of <i>M. longissimus dorsi</i> with increasing body weight, Meishan tended to decrease during growth.

Journal

  • Nihon Yoton Gakkaishi

    Nihon Yoton Gakkaishi 32(4), 213-220, 1995-12-25

    The Japanese Society of Swine Science

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Codes

  • NII Article ID (NAID)
    10008441093
  • NII NACSIS-CAT ID (NCID)
    AN10202971
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    0913882X
  • Data Source
    CJP  J-STAGE  JASI 
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