予測育種価に基づく黒毛和種の遺伝的改良
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概要
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Genetic relationships among carcass traits and between reproductive or growth traits and carcass traits were estimated for Japanese Black using REML procedure. Among carcass traits a low but favorable genetic correlation (-0.04) was obtained between two carcass traits relating to fat deposition; beef marbling score and subcutaneous fat thickness, suggesting that these traits could be improved simultaneously. Beef marbling score had a weak (-0.01) and an undesirable (0.25) relationships with daily gain of young bulls at performance testing and calving interval of breeding females, respectively. These estimates indicated truncation selection by daily gain would remove superior young bulls in marbling from selection candidates and selection by marbling would lead calving interval longer. Hence, selection criteria, such as estimated or predicted breeding values, of beef marbling and calving interval should be introduced into appropriate selection stages of breeding programs. However a caution will be needed for rapid increase in inbreeding because very low heritability (0.05) was estimated for calving interval. To avoid the problem a simulation study, which examines the effectiveness of a simple genetic algorithm to optimize mating design, was conducted. The mating designed by genetic algorithm succeeded to reduce 8.1% to 14.8% of inbreeding level for various heritabilities compared with random mating after nine generations of selection and mating. The possibility of the algorithm to maintain genetic diversity of Japanese Black was demonstrated.
- 2002-02-25
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- 交配種雄牛助言サービスソフト(MSAS)の繁殖現場での利用効果と問題点
- 予測育種価に基づく黒毛和種の遺伝的改良