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首页> 外文期刊>The Kasetsart Journal >Genetic Parameters For Birth Weight And Weaning Weight In Anglo-nubian, Saanen, Thai Native And Crossbred Goats
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Genetic Parameters For Birth Weight And Weaning Weight In Anglo-nubian, Saanen, Thai Native And Crossbred Goats

机译：盎格鲁努比亚，萨嫩，泰国土生和杂交山羊的出生体重和断奶体重的遗传参数

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摘要

Genetic parameters were estimated for birth weight and weaning weight in Anglo-Nubian, Saanen, Thai native and crossbred goat populations maintained at the Yala Livestock Research and Breeding Center. Records on 2,845 kids descended from 54 bucks and 615 does from 1995 to 2005 were included in the analysis. Analyses were carried out using the DFREML algorithm and fitting four different animal models that included or ignored maternal genetic and permanent environmental effects. In Model 1 only the direct genetic effect was fitted. The maternal permanent environmental effect was added in Model 2, while the maternal genetic effect was added in Model 3. In Model 4, the maternal genetic and permanent environmental effects were included from Model 1. The genetic covariance between the direct and maternal effects was included in Models 3 and 4. The estimates of direct heritability increased when the maternal genetic effect was added with the direct and maternal covariance. The estimates of maternal heritability slightly decreased when the maternal permanent environmental effect was added to the model. The direct-maternal genetic correlation estimates were negative, whereas estimates of the maternal permanent environmental variance as a proportion of phenotypic variance were low. The likelihood ratio test showed that Model 4 was the best for birth weight and Model 3 was the best for weaning weight.
机译：估计了Yala家畜研究和繁育中心维持的盎格鲁-努比亚人，萨嫩人，泰国本地人和杂交山羊种群的出生体重和断奶体重的遗传参数。分析包括1995年至2005年的2845名孩子的记录，这些孩子的收入分别为54美元和615美元。使用DFREML算法进行了分析，并拟合了四种不同的动物模型，这些模型包括或忽略了母体的遗传和永久环境影响。在模型1中，仅拟合了直接遗传效应。在模型2中添加了孕产妇的永久环境效应，在模型3中添加了孕产妇的遗传效应。在模型4中，模型1包括了孕产妇的遗传和永久环境效应。在直接和孕育效应之间包括了遗传协方差。在模型3和模型4中，当将母体遗传效应与直接和母体协方差相加时，对直接遗传力的估计会增加。当将母亲的永久环境影响添加到模型中时，对母亲遗传力的估计会略有下降。直接母亲遗传相关估计为负，而母亲永久环境变异作为表型变异的比例估计较低。似然比测试显示，模型4最适合出生体重，模型3最适合断奶体重。

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