Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (11): 2280-2287.doi: 10.3864/j.issn.0578-1752.2012.11.018

• ANIMAL SCIENCE·RESOURCE INSECT • Previous Articles     Next Articles

Comparison and Analysis of Genetic Parameters of Growth Traits of Qinghai Fine-Wool Sheep Estimated by Different Models

 WANG  Peng-Yu, GUAN  Que-Zha-Xi, QI  Quan-Qing, DE  Mao, ZHANG  Yan-Jun, WANG  Rui-Jun, ZHANG  Wen-Guang, LI  Jin-Quan   

  1. 1.内蒙古农业大学动物科学学院，呼和浩特 010018
    2.青海省三角城种羊场，青海刚察  812300
  • Received:2011-10-17 Online:2012-06-01 Published:2012-02-23

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Abstract: 【Objective】The effects of different animal models on estimation of genetic parameters of growth traits of Qinghai Fine-Wool sheep were investigated. 【Method】 The genetic parameters for growth 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. Eight models were constructed on the basis of different random effects in models. All models contain the fixed effects, direct genetic effects, and residual effects. The random effects include individual permanent environmental effects, maternal genetic effects, and maternal permanent environmental effects.【Result】The direct heritabilities were 0.1696-0.3781, 0.2520-0.3291, 0.2244-0.3506, and 0.2205-0.3981 for birth weight (BWT), weaning weight (WWT), yearling weight (YWT), hogget weight (HWT), respectively, and the maternal heritability were 0.0001-0.0900, 0.0002-0.0759, 0.0001-0.0918, and 0.0000-0.0006 for BWT, WWT, YWT, HWT, respectively. Compared with model 1, both model 3 and model 8 were significant (P＜0.01) for BWT, and model 3 was significant (P＜0.01) for WWT, other models were not significant (P＞0.05) for YWT and HWT by likelihood ratio test. Compared with model 2, model 8 was significant (P＜0.01) for BWT, model 6 was significant (P＜0.01) for YWT, both model 5 and model 8 were significant (P＜0.01) for HWT, by likelihood ratio test. Compared with model 3, models 5, 6, 7, 8 were not significant (P＞0.05) for all growth traits by likelihood ratio test. Compared with model 4, both models 5 and model 8 were significant (P＜0.01) for BWT; model 6 was significant (P＜0.01) for YWT, by likelihood ratio test.【Conclusion】Model 3 is fit for birth weight, weaning weight, and model 1 is fit for yearling weight, hogget weight. The maternal effects are important determinants of estimating the genetic parameters of birth weight and weaning weight. The direct heritabilities are 0.1995, 0.2552, 0.3438, and 0.2205 for BWT, WWT , YWT, HWT , respectively.

Key words: Qinghai Fine-Wool sheep, growth traits, genetic parameters, animal models, heritabilities

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