書誌事項
- タイトル別名
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- Estimation of Genetic Parameters on Growth and Nursing Ability in Japanese Brown Cattle
- カツモウワシュ ニ オケル ハツイクセイ オヨビ ホイク ノウリョク ニ カン
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抄録
Preweaning growth of a calf is the conjugated trait as calf growth and nursing ability. In addition, maternal effects may be composed of both additive genetic and permanent environmental effects. In this study, a model suitable to estimate genetic parameters for growth and nursing ability under grazing was investigated and the parameters were estimated for birth weight and preweaning daily gains in 657 Japanese Brown calves. These traits were analyzed using two different models (model 1 and 2). In model 2, maternal effect was devided into the breeding value and other effects, while not in model 1. Genetic parameters were estimated by the Derivative-Free Restricted Maximum Likelihood with the pedigree traced back 2 generations. The model 2 was more suitable to estimate maternal heritability for preweaning daily gain than the model 1. Direct heritability for birth weight was estimated as 0.40. Direct heritability for daily gain from birth until the months weighed increased as they grew older. The highest direct heritability (0.48) was estimated old at six months. The direct-maternal genetic corelations tended to be negative. The highest estimates of heritability and repeatability for maternal effect were obtained for daily gain until three months (0.31 and 0.42, respectively). It is concluded that the most probable producing ability (MPPA) for nursing ability in Japanese Brown cattle is predicted most appropiately by daily gain until three months.
収録刊行物
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- 日本畜産学会報
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日本畜産学会報 66 (9), 802-806, 1995
公益社団法人 日本畜産学会
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詳細情報 詳細情報について
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- CRID
- 1390001205196977024
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- NII論文ID
- 10024581755
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- NII書誌ID
- AN00195188
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- ISSN
- 18808255
- 00215309
- 1346907X
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- NDL書誌ID
- 3644081
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
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- 抄録ライセンスフラグ
- 使用不可