Wang Peng-Yu, Guanque Zha-Xi, Qi Quan-Qing, De Mao, Zhang Wen-Guang, Li Jin-Quan
College of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, China.
Yi Chuan. 2012 May;34(5):584-90. doi: 10.3724/sp.j.1005.2012.00584.
The maternal genetic effects on estimating genetic parameters for growth traits and wool traits of Qinghai fine-wool sheep were investigated.The genetic parameters for production traits of Qinghai fine-wool sheep were estimated by average information restricted maximum likelihood (AIREML) with different animal models, and the differences between different animal models were tested by likelihood ratio test. Fixed effects, direct genetic effects, and residual effects were included all models; and random effects were individual permanence environmental effects, maternal genetic effects, and maternal permanence environmental effects. The six models differ in the way of considering random effects: in model 1 individual permanence environmental effects, maternal genetic effects, and maternal permanence environmental effects were not contained; in model 2 maternal permanence environmental effects were included; in model 3 maternal genetic effects were included; in model 4 both maternal genetic effects and maternal permanence environmental effects were include; in model 5 both individual permanence environmental effects and maternal genetic effects were contained;in model 6 all random effects were contained. The direct heritabilities were 0.18960.3781, 0.25370.2890, 0.22440.3225, 0.22050.3983, 0.12180.1490, 0.09830.4802, and 0.1170~0.1311 for birth weight, weaning weight, yearling weight, hogget weight,greasy fleece weight, fiber diameter, and staple length,respectively. Compared with model 1, model 3 was-significant(P<0.01) for birth weight and weaning weight, other models were not significant (P>0.05)for Yearling weight, Hogget weight; and paralleled with model 6, both model 4 and model 5 were significant(P<0.01) for fiber diameter,model 4 was significant(P<0.05) for staple length, and other models were not significant(P>0.05) for greasy fleece weight by likelihood ratio test.The maternal effects were important determinants of estimated the genetic parameters for birth weight, weaning weigh, fiber diameter, and staple length, but were not significant for yearling weight, and hogget weight, and was slightly significant for greasy fleece weight.
研究了母本遗传效应对青海细毛羊生长性状和羊毛性状遗传参数估计的影响。采用平均信息约束最大似然法（AIREML），利用不同动物模型估计青海细毛羊生产性状的遗传参数，并通过似然比检验比较不同动物模型间的差异。所有模型均包含固定效应、直接遗传效应和残差效应；随机效应包括个体永久环境效应、母本遗传效应和母本永久环境效应。六个模型在考虑随机效应的方式上有所不同：模型1不包含个体永久环境效应、母本遗传效应和母本永久环境效应；模型2包含母本永久环境效应；模型3包含母本遗传效应；模型4同时包含母本遗传效应和母本永久环境效应；模型5同时包含个体永久环境效应和母本遗传效应；模型6包含所有随机效应。出生重、断奶重、周岁体重、育成羊体重、毛丛重、纤维直径和毛长的直接遗传力分别为0.18960.3781、0.25370.2890、0.22440.3225、0.22050.3983、0.12180.1490、0.09830.4802和0.1170~0.1311。似然比检验结果表明，与模型1相比，模型3对出生重和断奶重有显著影响（P<0.01），其他模型对周岁体重和育成羊体重无显著影响（P>0.05）；与模型6相比，模型4和模型5对纤维直径有显著影响（P<0.01），模型4对毛长有显著影响（P<0.05），其他模型对毛丛重无显著影响（P>0.05）。母本效应是出生重、断奶重、纤维直径和毛长遗传参数估计的重要决定因素，但对周岁体重和育成羊体重无显著影响，对毛丛重有轻微显著影响。
