Estimates of (co)variance components for productive and composite reproductive traits in Iranian Cashmere goats
Estimates of (co)variance components for productive and composite reproductive traits in Iranian Cashmere goats
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DOI：
10.1016/j.livsci.2009.06.016
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发表时间：
2009-12-01
影响因子：
1.8
通讯作者：
Jahanshahi, A. Safi
中科院分区：
文献类型：
--
作者：
Maghsoudi, A.;Torshizi, R. Vaez;Jahanshahi, A. Safi
本研究的目的是估计伊朗绒山羊的方差和协方差分量。采用单变量和多变量动物模型，采用REML程序，对每头母猪第一胎(TWW1)、第二胎(TWW2)和第三胎(TWW3)的初生重(BWT)、断奶重(WWT)和断奶仔数总重(TWW)进行统计分析。这项分析基于2313份儿童记录和940份DOS记录。通过忽略或计入母体加性遗传效应或母体永久性环境效应，四种不同的模型适用于BWT和WWT表演。对于TWW性能，只使用了两种模型(无服务父系效应和有服务父系效应)。模型比较采用似然比检验。直接加性遗传效应和母体永久性环境效应对体增重和日增重有显著影响。这些影响分别占9.4%和15.6%。表型变异分别占13.9%和6.7%。分别进行了分析。服役年限对TWW无显著影响。TWW1、TWW2和TWW3的遗传力估计分别为0.072、0.109和0.082。所有生产性能之间的直接遗传相关均为正相关，且呈低(体重与体重)到高(体重与体重、体重与体重)的正相关。表型相关性和残差相关性的相应估计值为中等，且低于遗传相关性。WWT和TWW之间的高度遗传相关表明，在TWW1上进行直接选择或在WWT上进行间接选择会增加每只母鹿的断奶总体重。(C)2009年，爱思唯尔出版。
The objective of this study was to estimate variance and covariance components, in Iranian Cashmere goats. for birth weight (BWT) and weaning weight (WWT) performances of kids and total weight of kids weaned (TWW) per doe joined at first (TWW1), second (TWW2) and third (TWW3) parities by REML procedures using univariate and multivariate animal models. The analysis was based on 2313 records of kids and 940 records of does. Through ignoring or including maternal additive genetic or maternal permanent environmental effects, four different models were fitted for BWT and WWT performances. For TWW performances only two models (without or with service sire effect) were used. Models were compared using likelihood ratio test. Direct additive genetic and maternal permanent environmental effects had significant influence on BWT and WWT performances. These effects accounted for 9.4% and 15.6%. and 13.9% and 6.7% of phenotypic variation. respectively. No significant effect of service sire was observed on TWW. The estimates of heritabilities were 0.072, 0.109 and 0.082 for TWW1, TWW2 and TWW3, respectively. Direct genetic correlations among all performances were positive and low (for BWT with TWW) to high (for BWT with WWT and WWT with TWW). The corresponding estimates for phenotypic and residual correlations were moderate and lower than genetic correlations. The high genetic correlation among WWT and TWW suggests that direct selection on TWW1 or indirect selection on WWT would increase total weight of kids weaned per doe joined. (C) 2009 Published by Elsevier B.V.