沖縄における黒毛和種屠肉形質の年次推移

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タイトル別名
  • Yearly Trends of Carcass Traits of Japanese Black Steers in Okinawa
  • オキナワ ニ オケル クロゲワシュ トニク ケイシツ ノ ネンジ スイイ エイ

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抄録

Yearly carcass trait trends were investigated via field carcass records to monitor genetic improvement in Japanese Black steers. Mean carcass weight showed a downward trend during the period from 1977 to 1982 (birth year of steers), whereas there was no obvious trend in DCG (daily carcass gain), rib eye area, marbling score or carcass grade.Coefficients of variation for marbling score and carcass grade were large, and the trend in carcass grade moved consis-tently upward from 1977 to 1982.These results suggest a shift in grade from 2nd to 3rd grade.It was thought that genetic trends were consistently improved in DCG, marbling score and carcass grade.The genetic trends in carcass weight and rib eye are area moved upward in the early period but were almost constant in later stages.The least-squares means of year effect in rib eye area were virtually constant during the period covered in this study, whereas the trends derived via least-squares means for carcass weight and DCG were slightly downward.The trends in marbling score and carcass grade were consistently downward.Consequently, genetic improvement was successfully achieved in marbling score and carcass grade, although negative environmental effects seem to hide these upward genetic trends.The genetic trends in carcass weight and rib eye area need to be monitored further, because their recent progress was lower.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 58 (11), 954-960, 1987

    公益社団法人 日本畜産学会

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