黒毛和種の枝肉構成に影響を及ぼす要因と枝肉構成の簡易評価技術  [in Japanese] Factors affecting carcass composition and simple technique for the evaluation of carcass composition in Japanese Black cattle  [in Japanese]

    • 撫 年浩 NADE Toshihiro
    • 日本獣医生命科学大学応用生命科学部 Department of Animal Science, Nippon Veterinary Life Science University

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Abstract

黒毛和種の改良は肉質のみならず枝肉構成の改良が必要である.枝肉構成は品種などの遺伝的要因により影響を受ける.飼養管理の影響では肥育開始後の飼養管理の違いは,最大成長が早期である骨には影響がなく,次いで最大成長となる筋肉では若干の影響が見られ,最大成長が遅い脂肪では,大きな影響が見られた.さらに,出荷月齢を延長した場合は,筋肉より脂肪が増加することを示している.枝肉構成の簡易推定技術では,これまでの成果から枝肉重量と枝肉切開面の脂肪に関する画像情報を取り込むことで,推定精度が向上する.また,より正確な枝肉構成を予測するためには品種および雌雄ごとに検討する必要がある.さらに,今後,超音波診断技術等からの生体情報と枝肉構成の推定技術と併せることで,生体において高精度で牛枝肉構成を推定することが可能となり,より効率的に肉用牛の枝肉構成に関する育種改良や飼養管理技術の改善が進むとしている.

The carcass from Japanese Black cattle has recently become heavier, and the Japanese Black cattle have improved meat quantity as well as meat quality. It is necessary to improve the meat quality and carcass composition of beef cattle in Japan. This review describes a genetic effect, a simple technique for estimating the carcass composition, and a technique for evaluating the carcass composition of live animals in the future. The characteristics of the carcass composition differ among some breeds in Japan. Japanese Black steer has a larger rib-eye area and thicker rib thickness than those of the Holstein. The muscle and fat of the Japanese Black steer grow through the fattening period. Feed management has less effect on bone tissue which has the highest growth rate early in life, with little muscle. The difference in the feed management did not influence bone weight whose maximum growth occurred in an early stage, slight influences was shown in muscle weight that had the maximum growth in a middle stage, and large influence appeared in the fat with a late maximum growth. In addition, when month old shipments are extended, it showed that the fat increased more than the muscles in the carcass. For the simple estimated technique of the carcass composition, it showed that the estimated accuracy was improved by taking the image information concerning the carcass weight and fat of the carcass cross-section from some previous results. Moreover, it was necessary to examine each breed and sex individually in order to estimate carcass composition more accurately. The carcass composition in a live animal could be estimated using the body weight and other information, such as the fat thickness and muscle area, etc, using an ultrasonic measurement technique. Estimating the carcass composition with a high accuracy by the technique which combines the ultrasonic measurement technique, etc, in the live animal and the estimating technique of the carcass composition in the future becomes possible. Also, the breeding improvement concerning the carcass composition of the beef cattle and the improvement of the breeding management technique will be more efficiently advanced. Furthermore, research on the carcass composition should continue to be studied using the timely beef cattle and carcass for improvement of the breed and feed management with more accurate data.

Journal

Nihon Chikusan Gakkaiho  

Nihon Chikusan Gakkaiho 79(4), 459-466, 2008-11-25 

Japanese Society of Animal Science

References:  39

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Codes

  • NII Article ID (NAID) :
    10025840848
  • NII NACSIS-CAT ID (NCID) :
    AN00195188
  • Text Lang :
    JPN
  • Article Type :
    REV
  • ISSN :
    1346907X
  • NDL Article ID :
    9732637
  • NDL Source Classification :
    ZR22(科学技術--農林水産--畜産)
  • NDL Call No. :
    Z18-348
  • Databases :
    CJP  NDL  J-STAGE