Genetic parameter estimates for growth-related traits of blunt snout bream (Megalobrama amblycephala) using microsatellite-based pedigree
Genetic parameter estimates for growth-related traits of blunt snout bream (Megalobrama amblycephala) using microsatellite-based pedigree
复制标题
使用基于微卫星的谱系估计钝口鳊（团头鲂）生长相关性状的遗传参数
DOI：
10.1111/are.12133
复制
发表时间：
2014-10-01
影响因子：
2
通讯作者：
Gao, Zexia
中科院分区：
文献类型：
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作者：
Luo, Wei;Zeng, Cong;Gao, Zexia
钝口鲷（Megalobrama amblycephala）是中国土生土长的草食性淡水鱼种，是我国淡水混养系统中公认的主要养殖品种，具有较高的经济价值。重要经济性状的遗传参数估计是其选择育种的必要条件。本研究旨在利用基于微卫星的家系分析方法，估算其生长相关性状的遗传力，并探讨各性状间的遗传和表型相关性。在一个公共池塘中饲养92种大规模产卵的亲鱼（42种和50种）的后代，并使用9个微型卫星来识别每个取样后代的父母。在随机选择的749个子代中，708个（94.53%）可直接分配给单个亲本对，用于遗传力估计。采用动物模型，用限制性最大似然法（REML）对数据进行分析，结果表明，体重、体长、总长和体高的遗传力分别为0.65、0.53、0.53和0.50。这4个性状之间存在较高的遗传相关性。由此可见，以生长为选择对象的选择在双头田鼠中是可行的，以体长为选择对象的其他生长性状也会相应提高。
Blunt snout bream (Megalobrama amblycephala )i s an herbivorous freshwater fish species native to China and has been recognized as a main aquaculture species in the Chinese freshwater polyculture system with high economic value. The genetic parameter estimates for important economic traits are needed for its selective breeding. The aim of this study was to estimate the heritabilities for its growth-related traits and explore the genetic and phenotypic correlations among the traits using microsatellite-based pedigree approach. Offspring from a mass-spawning of 92 broodstocks (42 sires and 50 dams) were reared in a communal pond and nine microsatellites were used to identify the parents of each sampled offspring. Of 749 offspring randomly selected, 708 (94.53%) could be assigned directly to a single parental pair, which was used for heritability estimates. Data were analysed using the method of restricted maximum likelihood (REML) using animal model and the results showed that the heritabilities of body weight, body length, total length and body height were 0.65, 0.53, 0.53 and 0.50, respectively. High genetic correlations were found among these four traits. According to these results, selection for growth seems to be feasible in M. amblycephala and the other growth traits will be heightened accordingly with the selection based on body length.