黒毛和種直接検定牛における優性血縁関係の程度とその遺伝的評価

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タイトル別名
  • Additive and Dominance Genetic Variances for Daily Gain of Performance Tested Japanese Black Bulls under Animal Models
  • クロゲワシュ チョクセツ ケンテイ ウシ ニ オケル ユウセイ ケツエン カン

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説明

It is necessary to consider dominance effect if it exists, in order to increase the accuracy of predicted additive genetic effect. In this study, both of the additive and the dominance genetic relationships among Japanese Black bulls, and additive and dominance variances were evaluated. The data analyzed was on daily gain during performance testing from 1974 to 1992 at Kagoshima Prefectural Animal Experiment Station. The number of animals evaluated were 636 young bulls with records and 579 ancestor animals to tie relationships among those tested bulls. Among the evaluated 1215 animals, average additive relationship was 0.039, and percentage of combination with relationship was 34.5% with average relationship of 0.113. Average dominance relationship was 0.0005, and pairs with dominance relationship were only 2.1% with average relationship of 0.0253. Heritability in narrow sense was 0.179 with simple additive genetic model, and 0.193 with additive model accounting for inbreeding depression. Dominance genetic variance was estimated at 0.001. Therefore, heritability in dominance genetic model was 0.189 and 0.226, in narrow and broad sense, respectively. All results such as variance component estimates, genetic. value predictions, accuracy and rank correlation for predicted breeding values under dominance genetic model were not different from those under additive model accounting for inbreeding depression. It was concluded that the model accounted for dominance effects was dispensable and the model with the regression on inbreeding coefficients was effective at the genetic evaluation in this kind of population.

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  • 日本畜産学会報

    日本畜産学会報 65 (12), 1083-1091, 1994

    公益社団法人 日本畜産学会

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