| 摘要: |
| 以2代选育群体为亲本、采用巢式设计构建21个施氏獭蛤（Lutraria sieboldii）全同胞家系，利用混合线性模型对30日龄和80日龄施氏獭蛤生长性状进行遗传参数和育种值估计。结果显示：施氏獭蛤早期发育过程中壳长生长速度较壳高快，性状间遗传相关系数范围为0.96~0.98，表型相关系数范围为0.77~0.96，均呈正相关，80日龄施氏獭蛤壳长、壳高与体质量间表型相关系数较高；30日龄的壳长和壳高性状遗传力分别为0.31±0.02和0.25±0.01，80日龄的壳长、壳高、壳宽和体质量性状的遗传力分别为：0.35±0.27、0.27±0.20、0.06±0.04和0.25±0.19，壳宽性状遗传力为低遗传力，其余性状遗传力均属中等遗传力；不同性状个体育种值的前10家系相同率为70%~90%，基于育种值选择比基于表型值选择效率提高13%~30%（10%留种率）。研究表明：施氏獭蛤早期对体质量性状进行选择时可参考壳长、壳高性状，早期利用壳长、壳高和体质量性状进行选择时遗传进度高，利用个体育种值进行选择具有更高的优势。研究结果将为施氏獭蛤生长性状选择育种提供了参考依据。 |
| 关键词: 施氏獭蛤(Lutraria sieboldii) 全同胞家系 生长性状 遗传参数 育种值 |
| DOI：10.11759/hykx20200506001 |
| 分类号:S968.3 |
| 基金项目:广西创新驱动重大专项（桂科AA19254008）；广西重点研发项目（桂科AB16380104） |
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| Estimation of genetic parameters and breeding values of early growth traits of Lutraria sieboldii |
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ZOU Jie1, ZHANG Shou-du2, PENG Hui-jing1, ZHENG De-bin3
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1.Guangxi Institute of Oceanology, Beihai 536000, China;2.National Oceanographic Center, Qingdao 266071, China;3.Tianjin Bohai Sea Fisheries Research Institute, Tianjin 300457, China
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| Abstract: |
| In this study, we constructed the 21 Lutraria sieboldii full-sib families in a balanced nested design by using the parents from a second-generation selective population. We estimated the genetic parameters and breeding values of growth traits at the 30th and 80th days of growth via a mixed linear model. The results showed that the shell width showed a faster growth than the shell length at an early growth stage, whereas the correlation coefficient of growth traits from 0.96 to 0.98 and the phenotypic correlation coefficient ranged from 0.77 to 0.96. There were relatively higher performances of correlation coefficient between the shell length or shell width and body mass on the 80th day of growth. Our results showed that the shell width had a low heritability, whereas other growth traits had medium heritability. Heritabilities of shell length and shell width on the 30th day of growth were 0.31±0.02 and 0.25±0.01, respectively. Moreover, the heritabilities of shell length, shell height, shell width, and body mass on the 80th day of growth were 0.35±0.27, 0.27±0.20, 0.06±0.04, and 0.25±0.19, respectively. The selective efficiency based on the breeding value was higher than that of the selective efficiency based on the phenotype by an advantage of 13%~30%. The growth performance of the top 10 families, according to the breeding values of growth traits, had a similarity of 70%~90%. All the abovementioned outcomes indicated that there were high genetic gains observed in shell length, shell width, and body mass selection at an early growth stage, whereas a higher genetic gain was achieved by selection according to the breeding value. This study suggests a reasonable potential for the improvement of growth of Lutraria sieboldii for further selective breeding. |
| Key words: Lutraria sieboldii full-sib family growth traits genetic parameters breeding value |
