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首页> 外文期刊>African Journal of Biotechnology >Genetic and phenotypic parameters of body weight in Zandi sheep
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Genetic and phenotypic parameters of body weight in Zandi sheep

机译：赞迪绵羊体重的遗传和表型参数

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摘要

The purposes of this study were to estimate genetic parameters for growth traits and to develop a suitable model for the data set used.? Data were collected in the Zandi sheep breed from 1992 to 2007 from the Khojir Sheep Breeding Station, Tehran, Iran. Number of observation were 5711 for birth weight (BW), 4619 for weaning weight (WW) , 2801 for? body weight at 6-months of age (W6), 2124 for body weight at 9 months of age (W9) and 2113 for yearling weight (W12). (Co) variance components and corresponding genetic parameters were obtained with univariate and multivariate analyses fitting animal models using restricted maximum likelihood (REML) methods that accounted for fixed effects of sex, birth type, age of dam, year of birth and month of birth. Three different animal models were fitted. Based on the most appropriate model fitted, direct heritability, maternal heritability and maternal permanent environmental effect were estimated to range from 0.155 at BW to 0.357 at WW, 0.069 at WW to 0.157 at BW and 0.161 at W9 to 0.171 at W6, respectively. Phenotypic and genetic correlations between all traits were positive, demonstrating the effectiveness of the implemented breeding programs.
机译：这项研究的目的是估计生长性状的遗传参数，并为所使用的数据集开发合适的模型。 1992年至2007年间，从伊朗德黑兰Khojir绵羊育种站收集了Zandi绵羊品种的数据。观察数量为出生体重（BW）的5711，断奶体重（WW）的4619，对体重的2801？ 6个月大（W6）的体重，9个月大（W9）的体重为2124，一岁体重（W12）的2113。 （Co）方差成分和相应的遗传参数是通过使用受限最大可能性（REML）方法拟合动物模型的单变量和多变量分析获得的，该方法解释了性别，出生类型，母亲的年龄，出生年份和出生月份的固定影响。拟合了三种不同的动物模型。根据最合适的模型拟合，直接遗传力，母体遗传力和母体永久环境效应的估计范围分别为：BW处的0.155至WW的0.357，WW处的0.069至BW的0.157和W9处的0.161至W6的0.171。所有性状之间的表型和遗传相关均为正相关，证明了已实施育种计划的有效性。

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