团头鲂生长性状的遗传力和育种值估计  

Estimations of heritabilities and breeding values for growth traits in Megalobrama amblycephala

作　　者：曾聪[1] 曹小娟[1] 高泽霞[1] 罗伟[1] 钱雪桥 王卫民[1] 

机构地区：[1]华中农业大学水产学院/农业动物遗传育种与繁育教育部重点实验室/农业部淡水生物繁育重点实验室,武汉430070 [2]广东海大集团股份有限公司,广州511400

出　　处：《华中农业大学学报》2014年第2期89-95,共7页Journal of Huazhong Agricultural University

基　　金：现代农业产业技术体系建设专项(CARS-46-05);中央高校基本科研业务费专项(2011PY023);华中农业大学科研启动项目(52902-0900206038);海大集团团头鲂育种专项

摘　　要：采用混合家系遗传参数估计法对6月龄团头鲂(Megalobrama amblycephala)生长性状的遗传力、育种值和遗传相关等遗传参数进行估计。对表型的方差分析发现,方差组分中亲本导致的遗传方差组分远大于环境等因素导致的非遗传方差组分。通过混合家系估计的团头鲂6月龄体长、体质量和肥满度遗传力依次为0.72±0.21、0.49±0.14和0.48±0.14(P<0.01),体长属于高等遗传力的性状,而体质量和肥满度则属于中等遗传力的性状,表明这3个生长性状都主要受加性效应控制,这也说明3个性状均可以作为直接选育的性状,适合在早期选育以控制后代规模。在对体质量与体长的相关分析时发现,两性状之间存在极显著的正相关性(表型相关和遗传相关分别为0.89和0.98)(P<0.01),说明在体长和体质量之间存在间接选择反应。从单性状和综合育种值排名来看,体质量和体长育种值以及综合育种值三者之间的排名差异并不大,排名靠前的主要是鄱阳湖亲本的子代。The heritabilities and breeding values of growth traits （including body weight, body length and condition factor） for Megalobrama arnblycephala were estimated using mixed family model in this study. The variance analysis of growth traits revealed that variance caused by parents was much greater than that caused by environment at six-month stage. The heritability of body length, body weight and condition factor were 0.72±0. 21 （high heritability） ,0. 49±0. 14 （moderate heritability） and 0.48± 0.14 （moderate heritability） （P〈0.01）, meaning that most of the variance for all the three traits was genetic. The phenotypic and genetic correlation coefficient between body weight and body length were 0.89 and 0. 98 （P〈0.01） ,which indicated the correlation between body and body length was caused by genetic. The rank of estimated breeding values varied but not too much among body length, body weight and comprehensive, and most of the top 20 individuals were Poyang population＇s offspring.

关 键 词：团头鲂 生长性状 遗传力 育种值 多性状选育 

分 类 号：S961.2[农业科学—水产养殖]