Estimation of Variance Components of Additive and Maternal Effects on Reproductive Traits in Alxa Cashmere Goats
In this study,the genetic parameters of birth weight(BW),birth litter weight(TLW),weaned litter weight(WW),weaned litter weight(TWW),litter size(LZ)and gestation period(GP)of Alxa cashmere goats were estimated using ASreml software combined with constrained maximum likeli-hood(REML)method.6517 breeding traits records of Alxa cashmere goat breeding farms from 2017 to 2022 were collected.Eight different single-trait animal models were fitted,and the best model was selected by LRT test.The variance components and heritability of reproductive traits were estimated by the single-trait model,and the phenotypic and genetic correlations between reproductive traits were analyzed by the two-trait model.The results showed that the estimated heritability values of BW,TLW,WW,TWW,LZ and GP of Alashan white cashmere goats were 0.15±0.04,0.16±0.02,0.20±0.06,0.12±0.03,0.14± 0.03 and 0.32±0.05,respectively.The genetic correlation coefficient ranged from-0.49 to 0.73.The high-est genetic correlation coefficient between LZ and TLW was 0.73,and the lowest genetic correlation coeffi-cient between LZ and BW was-0.49.The phenotypic correlation ranged from-0.50 to 0.65,among which TWW and TLW had the highest phenotypic correlation coefficient of 0.65,followed by LZ and TLW with the phenotypic correlation coefficient of 0.61,and LZ and BW had the lowest phenotypic correlation coeffi-cient of-0.50.The results showed that the reproductive traits of Alxa cashmere goats were low heritability traits and were not only affected by non-genetic factors such as year and group,but also all the traits were affected by maternal effects.The high correlation between LZ and other reproductive traits indicates that selection based on LZ is effective and can improve the overall reproductive performance of ewes.In the ac-tual production process,the breeding performance of Alxa cashmere goats can be improved by improving the feeding management and nutrition level.
Alxa cashmere goatreproductive traitsanimal modelrestricted maximum likelihood(REML)
国家科技期刊平台
NSTL
万方数据
