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首页> 外文期刊>Archivos Latinoamericanos de Produccion Animal >Environmental and genetic trends for productive characteristics in Nellore cattle
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Environmental and genetic trends for productive characteristics in Nellore cattle

机译：内洛尔牛生产特性的环境和遗传趋势

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The objective this work were estimates the genetic parameters, direct an maternal effects to pre weaning gain and days to gain 160 kg, daily average gain after weaning and days to gain 240 kg after weaning and evaluated the genetic and environmental trends in Nellore cattle. The estimates of variances components and genetic values were made with MTDFREML program, animal model. The model used to pre weaning estimates was included the random effects direct and maternal and the correlations between than, environmental permanent dam effect, which fixed effect used contemporaneous group and age of dam in the parturition which a covariate (Linear and quadratic). For post weaning characteristic used the same model without maternal and environmental permanent dam effect. The genetic and environmental trends were estimates using the regression analysis of genetic value by year and contemporaneous group by year. The heritability coefficient to direct, maternal and the correlations direct maternal, environmental proportion of total variance and phenotypic variance to gain pre weaning, D160 and gain pos weaning and D240 were 0.13 ± 0.02, 0.17± 0.03, 0.09 ± 0.016, 0.14 ± 0.01; 0.06 ± 0.03, 0.06 ± 0.02, ., .; -0.36 ± 0.17, -0.43 ± 0.14, ., .; 2,888.77, 0.01262, 52,356.94, 0.01374; and, 3,653.68, 0.01645, 57,278.94 and 0.01604 respectively. The direct genetic trend and environmental trend were positive showing gain in the fell years. Perhaps, the maternal genetics trends were negative. The maternal ability need careful to not make an inverse selection to this trait.
机译：这项工作的目的是评估遗传参数，指导母体对断奶前增重的影响，以及日增重160公斤，断奶后的日平均增重和断奶后的日增重240公斤，并评估内洛尔牛的遗传和环境趋势。用MTDFREML程序，动物模型估算方差成分和遗传值。用于断奶前评估的模型包括直接和母体的随机效应以及环境永久性大坝效应之间的相关性，固定效应使用了分娩期间同时代和线性的大坝年龄（协变量）（线性和二次）。对于断奶后的特性，使用相同的模型，没有母体和环境的永久坝效应。遗传和环境趋势是使用逐年遗传值和逐年同期遗传值的回归分析估算的。直接母体的遗传力系数以及直接母体，环境的总方差和表型方差与断奶前的遗传比例，D160和断奶后的收益以及D240的相关系数分别为0.13±0.02、0.17±0.03、0.09±0.016、0.14±0.01; 0.06±0.03、0.06±0.02，...， -0.36±0.17，-0.43±0.14，。，。; 2,888.77、0.01262、52,356.94、0.01374;和3,653.68、0.01645、57,278.94和0.01604。直接遗传趋势和环境趋势呈正向，表明在下降的年份有所增加。也许，母亲的遗传学趋势是负面的。产妇的能力需要谨慎，不要对这一特征做出相反的选择。

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