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首页> 外文期刊>Animal Science Journal >Genetic parameters of postnatal mortality and birth weight in Japanese Black calves
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Genetic parameters of postnatal mortality and birth weight in Japanese Black calves

机译：日本黑小牛产后死亡率和出生体重的遗传参数

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摘要

Postnatal mortality (PM) of calves is an economically important trait, because a high mortality rate of calves decreases farm income and significantly increases production costs. In spite of the economic importance of PM, genetic studies on PM have been scarce for Japanese Black cattle. The objectives of this study were to estimate the direct and maternal heritability for PM using a Bayesian threshold model with Gibbs sampling in Japanese Black cattle. The original data consisted of 43723 records of animals born from January 2005 to June 2006. Four binary traits of mortality were considered: D1-14, D15-60, D61-180 and D1-180 with numbers indicating the period of risk in days after birth. Direct heritabilities for PM ranged from 0.12 to 0.31 and maternal heritabilities for PM were lower than the direct heritabilities and ranged from 0.02 to 0.16. Direct genetic correlations between D1-14 and D15-60, between D15-60 and D61-180, and between D1-14 and D61-180 were 0.501, 0.689 and 0.062, respectively. Direct genetic correlations of birth weight with D1-14, D15-60, D61-180 and D1-180 were 0.089, 0.482, 0.434 and 0.394, respectively. These results indicated that different genes were responsible for early and late PM and early PM (D1-14) can be genetically reduced without influencing birth weight.
机译：犊牛的产后死亡率（PM）是一个重要的经济特征，因为犊牛的高死亡率会降低农场的收入并显着增加生产成本。尽管PM具有重要的经济意义，但日本黑牛对PM的遗传研究却很少。这项研究的目的是使用贝叶斯阈值模型和吉布斯采样法估算日本黑牛的PM的直接和母体遗传力。原始数据包括2005年1月至2006年6月间出生的43723条动物记录。考虑了四个二元死亡率特征：D1-14，D15-60，D61-180和D1-180，其中的数字表示发生后的天数出生。 PM的直接遗传力在0.12至0.31之间，母体的PM遗传力低于直接遗传力，在0.02至0.16之间。 D1-14和D15-60之间，D15-60和D61-180之间以及D1-14和D61-180之间的直接遗传相关分别为0.501、0.689和0.062。出生体重与D1-14，D15-60，D61-180和D1-180的直接遗传相关性分别为0.089、0.482、0.434和0.394。这些结果表明，不同的基因导致了早期和晚期PM，而早期PM（D1-14）可以通过遗传降低而不影响出生体重。

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