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Genetic parameters for growth traits in Mexican Nellore cattle

机译：墨西哥内洛牛生长性状的遗传参数

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摘要

The aim of this study was to estimate genetic parameters for growth traits in Mexican Nellore cattle. A univariate animal model was used to estimate (co)variance components and genetic parameters. The traits evaluated were birth weight (BW), weaning weight (WW), and yearling weight (YW). Models used included the fixed effects of contemporary groups (herd, sex, year, and season of birth) and age of dam (linear and quadratic) as a covariate. They also included the animal, dam, and residual as random effects. Phenotypic means (SD) for BW, WW, and YW were 31.4 (1.6), 175 (32), and 333 (70) kg, respectively. Direct heritability, maternal heritability, and the genetic correlation between additive direct and maternal effects were 0.59, 0.17, and −0.90 for BW; 0.29, 0.17, and −0.90 for WW; and 0.24, 0.15, and −0.86 for YW, respectively. The results showed moderate direct and maternal heritabilities for the studied traits. The genetic correlations between direct and maternal effects were negative and high for all the traits indicating important tradeoffs between direct and maternal effects. There are significant possibilities for genetic progress for the growth traits studied if they are included in a breeding program considering these associations.
机译：这项研究的目的是估计墨西哥内罗尔牛生长性状的遗传参数。使用单变量动物模型来估计（协）方差成分和遗传参数。评估的特征是出生体重（BW），断奶体重（WW）和一岁体重（YW）。使用的模型包括当代群体（畜群，性别，年龄和出生季节）和水坝年龄（线性和二次方）的固定影响作为协变量。它们还包括动物，水坝和残余物作为随机效应。 BW，WW和YW的表型平均值（SD）分别为31.4（1.6），175（32）和333（70）kg。 BW的直接遗传力，母体遗传力以及加性直接效应和母体效应之间的遗传相关性分别为0.59、0.17和-0.90； WW为0.29、0.17和-0.90； YW分别为0.24、0.15和-0.86。结果表明，所研究的性状具有中等的直接遗传力和母体遗传力。对于所有性状，直接和母体效应之间的遗传相关性为负且高，表明直接和母体效应之间存在重要的权衡。如果考虑到这些相关性，将其纳入育种计划，则对于所研究的生长性状，遗传改良的可能性就很大。

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