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Estimates of phenotypic and genetic parameters for birth weight of Brown Swiss calves in Turkey using an animal model

机译：利用动物模型估算土耳其棕色瑞士小牛出生体重的表型和遗传参数

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摘要

A study was conducted to assess the influence of genetic and environmental factors on Brown Swiss calf birth weight, and to estimate variance components, genetic parameters, and breeding values. Data were collected on 1,761 Brown Swiss calves born from 1990 to 2005 in the Konuklar State Farm in Turkey. Mean birth weight for all calves was 39.3 +/- 0.09 kg. Least squares mean birth weights for male and female Brown Swiss calves were 40.3 +/- 0.02 and 39.0 +/- 0.02 kg, respectively. Variance components, genetic parameters, and breeding values for birth weight in Brown Swiss calves were estimated by restricted error maximum likelihood (REML)-best linear unbiased prediction(BLUP) procedures using an MTDFREML (multiple trait derivative free restricted maximum likelihood) program employing an animal model. Direct heritability ( (d) (2) ), maternal heritability ( (m) (2) ), total heritability ( (T) (2) ), (am) and (am) estimates were 0.12, 0.09, 0.23, -0.58, and -0.06, respectively. The estimated maternal permanent environmental variance expressed as a proportion of the phenotypic variance ( (2)) was 0.05. Breeding values were estimated for the trait and used to evaluate genetic trends across the time period investigated. The genetic trend linear regression was not different from zero. No genetic trend for birth weight was expected, since there had been no direct selection pressure on the trait. Absence of a trend confirms that there was no change due to selection pressure on correlated traits. Genetic and environmental parameter estimates were similar to literature values indicating that effective selection methods used in more developed improvement programs would be effective in Turkey as well.
机译：进行了一项研究，以评估遗传因素和环境因素对瑞士褐小牛出生体重的影响，并评估变异成分，遗传参数和育种值。数据收集自1990年至2005年在土耳其的Konuklar国家农场出生的1,761头棕色瑞士小牛。所有小牛的平均出生体重为39.3 +/- 0.09千克。最小二乘均表示雄性和雌性布朗瑞士犊牛的出生体重分别为40.3 +/- 0.02和39.0 +/- 0.02千克。采用MTDFREML（无性状导数限制最大似然）程序，通过限制误差最大似然（REML）-最佳线性无偏预测（BLUP）程序估算布朗瑞士小牛的出生体重的方差成分，遗传参数和育种值。动物模型。直接遗传力（（d）（2）），母体遗传力（（m）（2）），总遗传力（（T）（2）），（am）和（am）估计分别为0.12、0.09、0.23，-0.58 ，和-0.06。估计的孕产妇永久性环境方差表示为表型方差（（2））的比例为0.05。估计该性状的育种值，并用于评估所研究时间段内的遗传趋势。遗传趋势线性回归与零无差异。预计没有出生体重的遗传趋势，因为该性状没有直接选择的压力。缺乏趋势证实，由于对相关性状的选择压力，没有变化。遗传和环境参数估计值与文献值相似，表明在更发达的改进计划中使用的有效选择方法在土耳其也将有效。

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