运用贝叶斯方法估计中国美利奴羊(新疆型)毛用性状及繁殖性状的遗传参数

为了解中国美利奴羊（新疆型）近年来遗传结构的变化趋势以及探讨毛用性状与繁殖性状的遗传关系，需要进一步研究这些性状的遗传力以及它们之间的关系。本研究收集额敏县聚鑫细毛羊养殖专业合作社1985-2018年中国美利奴羊（新疆型）共计9 428只羊毛生产记录和1987-2018共计5 887只年繁殖记录，运用BLUPF90软件结合Gibbs抽样方法，利用单性状模型对中国美利奴（新疆型）毛用性状（细度支数、等级、总评分、毛长、污毛重和鉴定时体重）和繁殖性状（配种次数、妊娠天数、胎产羔数和总产羔数）进行方差组分和遗传力估计，利用双性状模型分析毛用性状与繁殖性状之间的遗传相关与表型相关。结果显示，中国美利奴羊（新疆型）毛用性状细度支数、等级、总评分、毛长、污毛重、鉴定时体重的遗传力估计值分别为0.471±0.020、0.088±0.030、0.114±0.018、0.426±0.025、0.328±0.041、0.317±0.046；繁殖性状配种次数、妊娠天数、胎产羔数及总产羔数的遗传力估计值分别为0.056±0.009、0.022±0.010、0.120±0.018、0.163±0.016；毛用性状与胎产羔数、总产羔数之间的遗传相关范围为-0.031~0.286，鉴定时体重与胎产羔数（0.286）、总产羔数（0.204）遗传相关最高，细度支数与胎产羔数（-0.143）、总产羔数（-0.048）呈负的遗传相关；毛用性状与胎产羔数、总产羔数之间的表型相关范围为-0.210~0.216，毛长与总产羔数（0.216）表型相关最高，细度支数与胎产羔数（-0.137）、总产羔数（-0.210）呈显著负表型相关。本研究结果发现，毛用性状与繁殖性状之间存在一定的关系，这一结果可为今后制定中国美利奴羊育种规划提供数据基础，为选育优质高产、繁殖性能好的细毛羊提供理论依据，从而进一步提高细毛羊产业经济效益。

Estimates of Genetic Parameters for Wool and Reproduction Traits in Chinese Merino Sheep(Xinjiang type) by Bayesian Method

In order to understand the genetic trends of Chinese Merino sheep (Xinjiang type) in recent years and to explore the genetic relationship between wool and reproductive traits, it is necessary to further study the heritability of these traits and their relationship. The records of wool production performance of 9 428 individuals (from 1985 to 2018) and the records of reproduction performance of 5 887 individuals (from 1987 to 2018) for Chinese Merino sheep (Xinjiang type) were collected from Juxin fine wool sheep breeding professional cooperative of Emin county. Using a single trait model by BLUPF90 software combined with Gibbs sampling method estimated the variance components and heritabilities for wool (fineness, quality, total fleece grade, staple length, greasy fleece weight and body weight pre-shearing)and reproduction traits (number of inseminations, gestation length, litter size, total number of lambs born), and using two-trait model estimated the genetic correlation and phenotypic correlation between wool and reproductive traits. The results showed that estimates of heritabilities for fineness, quality, total fleece grade, staple length, greasy fleece weight and body weight pre-shearing were 0.471±0.020, 0.088±0.030, 0.114±0.018, 0.426±0.025, 0.328±0.041, and 0.317±0.046, respectively; estimates of heritabilies for number of inseminations, gestation length, litter size and total number of lambs born were 0.056±0.009, 0.022±0.010, 0.120±0.018, and 0.163±0.016, respectively; estimates of genetic correlation between wool traits and litter size, total number of lambs born varied from -0.031 to 0.286, body weight pre-shearing showed the strongest relation to litter size (0.286) followed by total number of lambs born (0.204), fineness were negatively related to litter size (-0.143) and total number of lambs born (-0.048); estimates of phenotypic correlation between wool traits and litter size, total number of lambs born varied from -0.210 to 0.216, staple length showed the strongest relation to total number of lambs born (0.216), fineness were negatively related to litter size (-0.137) and total number of lambs born (-0.210). The results of this study found that there was a certain relationship between wool and reproduction traits. It can provide a data basis for the future development of Chinese Merino sheep breeding program, and provide a theoretical basis for the selection of fine wool sheep with good quality, high yield and good reproductive performance, so as to further improve the economic benefits of fine wool sheep industry.