摘要
为了评估大菱鲆选育F2的早期育种效果,采用3种方法,即,Ⅰ:比较F2选择系和对照系的最小二乘均值,Ⅱ:比较连续2代(F1和F2)选择系目标性状间的育种值,Ⅲ:比较F2选择系和对照系的育种值,估测了6月龄大菱鲆体重的选择反应,并进而分析了现实遗传力和遗传增益。结果表明,3种方法的选择反应估测值存在一定差异,其相应估测的现实遗传力和遗传增益也不相同;3种方法估测选择反应、现实遗传力和遗传获得的均值分别为3.1983±0.5880、0.2941±0.0531和8.70±1.60,显示出足够大的早期选择反应、中等的现实遗传力和较低的遗传获得,预示利用家系选育对大菱鲆进行遗传改良能够取得良好的育种成效,同时,这些群体还有很大的遗传改良潜力。
The second-generation selected line of turbot was constructed by a consecutive selection for faster growth in the base population. Response to selection for 6 months live weight of turbot （Scophthalmus maximus L.） were estimated by three methods：Ⅰ. Comparing the least squares means of the second-generation selected line and control line,Ⅱ. Comparing the estimated breeding values for live weight between the first- and the second-generation selected line, and Ⅲ. Comparing the estimated breeding values of the second-generation selected line and control line, respectively. Based on selection response values evaluated, realized heritability and genetic gain were also estimated. The results showed that response to selection, realized heritability and genetic gain estimated by three methods were different and their mean values were 3.1983±0.5880, 0.2941±0.0531 and 8.70±1.60, respectively, which revealed that large enough early selection response, moderate realized heritability and lower genetic gain were obtained. It was concluded that the family selection was an effective approach to improving growth traits of turbot, at the same time, the population still has additive genetic variance to enable further improvement.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2012年第1期57-61,共5页
Oceanologia Et Limnologia Sinica
基金
现代农业产业技术体系建设专项资金资助,CARS-50-G01号
关键词
大菱鲆
选择育种
选择反应
现实遗传力
Scophthalmus maximus
Selective breeding
Selection response
Realized heritability
