中国水产科学2018，Vol.25Issue(1)：18-25,8.DOI:10.3724/SP.J.1118.2018.17282
草鱼生长性状的遗传参数和育种值估计
Estimation of genetic parameters and breeding values for growth traits in grass carp(Ctenopharyngodon idellus)
摘要
Abstract
The objective of this study was to estimate genetic parameters and breeding values for growth traits in grass carp Ctenopharyngodon idellus,an important economic freshwater fish in China. A factorial mating design was carried out to construct 21 full-sib families by artificial fertilization, and their parents were from a nucleus breeding population. Animal models and REML procedures were used to estimate genetic, phenotypic, and envi-ronmental parameters for body weight (BW), standard length (SL), body height (BH), and condition factor (K) for 16-month-old C.idellus.The results showed large variations for growth traits in the breeding population.Moreo-ver, BW, SL, and BH traits displayed moderate to high levels of genetic variation (0.21 to 0.47) and relatively low heritability for condition factor (0.11). In addition, common environmental effects were relatively low for the four growth traits (0.07–0.17). Genetic and phenotypic correlations among BW, SL, and BH traits were all positive and ranged from 0.88 to 0.97. In contrast, the genetic correlations between K and BW or SL were close to zero, but not between K and BH (r=0.43). Overall, the results suggested that BW could be a single target trait for the genetic improvement of growth performance in grass carp. The individual breeding values were predicted using the best linear unbiased prediction (BLUP) method with the software ASREML. Selection was practiced on individual phenotype or breeding values for each trait. The results showed that, although Pearson's correlations between breeding values and phenotypic values for each trait were 0.77–0.93, the same selected individual rates for each trait ranged from 68.75% to 81.82%, and Spearman's correlation coefficients ranged from 0.19 to 0.81 at a 10% selection intensity. Both methods of selection presented significant differences, particularly for the trait with low herita-bility. This study provides a theoretical basis and technical support for selective breeding of growth traits in grass carp.关键词
草鱼/生长性状/遗传参数/育种值/选择育种Key words
Ctenopharyngodon idellus/growth traits/genetic parameters/breeding values/selective breeding分类
农业科技引用本文复制引用
姜鹏,韩林强,白俊杰,樊佳佳,陈柏湘,胡重江,周春龙,李胜杰..草鱼生长性状的遗传参数和育种值估计[J].中国水产科学,2018,25(1):18-25,8.基金项目
现代农业产业技术体系建设项目(CARS-45-04) （CARS-45-04）
广东省自然科学基金项目(2015A030313702) （2015A030313702）
广东省海洋渔业科技与产业发展专项科技攻关与研发项目(A201401A03). （A201401A03）
