黒毛和種雌牛集団における体測定値および繁殖形質の遺伝的趨勢 Genetic Trends of Body Measurements and Reproductive Traits in a Japanese Black Cow Population

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黒毛和種雌牛集団における体測定値および繁殖形質の遺伝的趨勢を多形質REML法のアニマルモデルを使って育種価を予測することによって検討した.分析材料は1991年および1992年に基本登録および本原登録された黒毛和種雌牛14,881頭の体高,胸囲,胸深,尻長,かん幅,体重の登録時測定値および初産月齢,分娩間隔(初産と2産間),初産と2産の平均妊娠期間の記録である.1975年から1989年に生まれた雌牛(材料牛の母牛)の体高,胸囲,胸深,尻長,体重の予測育種価は,回帰分析の結果それぞれ生年次が進むにつれてわずかながら大きくなる傾向が認められたが,かん幅の予測育種価は生年次により変動しなかった.1975年から1987年に生まれた種雄牛(材料牛の父牛)のいずれの体測定値の予測育種価にもわずかながら変動が認められた.1975年から1989年に生まれた雌牛の分娩間隔の予測育種価には,生年次に伴う変動が認められなかったが,雌牛の初産月齢,分娩間隔の予測育種価は,生年次が進むにつれてわずかながら有意に大きくなる傾向が認められた.以上の結果,枝肉の質の改良に重点をおいた黒毛和種における改良戦略は,登録雌牛の体サイズや繁殖性にとくに悪い影響を及ぼすことはないようであった.

A study was made to investigate the genetic trends of body measurements at registration and reproductive traits in a cow population of the Japanese Black. The data were collected from 14, 881 Japanese Black cows which were registered in 1991 and 1992. The body measurements analyzed were withers height, chest girth, chest depth, rump length, thurl width and body weight, while the reproductive traits were age at first calving, calving interval and gestation length. Breeding values of the cows and their dams were predicted by using an animal model with multiple-trait REML procedure. Average predicted breeding value (PBV) was calculated by year of birth of predicted animals in order to obtain the genetic trends for each trait. The results of regression analysis showed that the PBV of the cows born from 1975 to 1989 increased high significantly for withers height, chest girth, rump length and body weight, respectively, while the PBV of cows for chest depth tended to increase slightly. On the other hand, no change was found in the PBV of cows for thurl width. The PBV of the sires born from 1975 to 1987 for all body measurements had a tendency to fluctuate slightly. The PBV of cows for age at first calving and gestation length tended to increase slightly and significantly during the period of 1975 to 1989. There was no change in the PBV of the cows born from 1975 to 1989 for first calving interval. It may be concluded that the improvement strategy of placing an emphasis on carcass quality appears to have not given up to date any special bad effect on the genetic trends of body size and reproductivity in Japanese Black cows population.

収録刊行物

  • 日本畜産學會報 = The Japanese journal of zootechnical science  

    日本畜産學會報 = The Japanese journal of zootechnical science 69(3), 231-238, 1998-03-25 

    Japanese Society of Animal Science

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各種コード

  • NII論文ID(NAID)
    10021726515
  • NII書誌ID(NCID)
    AN00195188
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    1346907X
  • データ提供元
    CJP書誌  J-STAGE 
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