Relationship between genetic abilities of Japanese Black sires predicted from Japanese Black and crossbred population

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  • 交雑種の枝肉格付形質に対する種雄牛×母の品種による交互作用の検討
  • コウザツシュ ノ エダニク カクズケ ケイシツ ニ タイスル タネオスギュウ × ハハ ノ ヒンシュ ニ ヨル コウゴ サヨウ ノ ケントウ

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Abstract

In Japan, crossbreds (F1) of Holstein cow sired by Japanese Black (JB) cattle have been an important source of beef products, occupying about 25% of the number of graded beef carcasses. However, to date, a unique genetic evaluation of F1 has not been conducted. Thus, dairy farmers have to depend on JB sires by breeding values predicted from JB data, but interactions could exist between sire and breed of dam. The objective of this study was to explore the need for a unique evaluation of F1 by investigating such interactions. These were evaluated as genetic correlation (rg) using a 2-trait sire model which regarded the identical traits from each breed (JB and F1) as different. Six grading traits, such as beef marbling standard (BMS), were analyzed. A high rg between JB and F1 was estimated for BMS (0.91). Subsequently, Spearman’s correlation coefficient of the expected progeny difference (EPD) of JB sires predicted from JB and F1 population was calculated and showed a high value (0.96), indicating that there was a little interaction. With similar results for other traits, EPD predicted from JB data would be applicable for F1 production.

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