Genetic parameters and response to selection of harvest body weight of the Chinese shrimp Fenneropenaeus chinensis after five generations of multi-trait selection

文献类型： 外文期刊

第一作者： Sui, Juan

作者： Sui, Juan;Luan, Sheng;Luo, Kun;Meng, Xianhong;Cao, Baoxiang;Liu, Ning;Li, Wenjia;Lu, Xia;Chai, Zhan;Kong, Jie

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关键词： Fenneropenaeus chinensis;Harvest body weight;Heritability;Selection response

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

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收录情况： SCI

摘要： Genetic parameters and predicted and realized selection responses were estimated for harvest body weight of Chinese shrimp (Fenneropenaeus chinensis) after five generations of multi-trait selection. The body weights of 15,201 tagged shrimp representing 460 full-sib families in 6 generations were recorded at harvest. Heritability estimates for body weight showed large variation in magnitude (0.00 +/- 0.00-0.36 +/- 0.07) when analyzing data from each generation separately. When data from all generations (G(0)-G(5)) were included in analysis, the heritability estimate for body weight was 0.18. While, G(0) was more affected by environmental conditions than the other generation in this study, when data from G(0) was excluded, the heritability was 0.21. The common environment effect estimate was 0.08 when all data included and 0.06 when G(1)-G(5) included. The females were significantly larger than the males at harvest (P < 0.05). The genetic correlation of the harvest body weight between sexes was similar within and across generations, indicating that body weight in male and female shrimp is likely controlled by the same genes. Breeding candidates in the base population (G(0)) were selected according to their individual breeding values for growth. In later generations (G(1)-G(5)), candidates were selected according to a selection index including breeding values for growth, survival time after WSSV infection and pond survival. The response to selection for harvest body weight was estimated by two methods (the realized and predicted responses). The realized response was estimated from the differences in the least square means of body weight between the selection and control populations. The predicted response was obtained from the differences in the mean breeding values between generations. The accumulated realized response was 18.60% after performing five selections. The accumulated predicted responses estimated using two sets of genetic parameters obtained from within and across generation datasets were 6.43% and 6.50%, respectively. The results are discussed in a practical context of developing selective breeding programs for Chinese shrimp, and it is indicated that the selective breeding program has generated effective genetic improvement after five generations of selection. The future direction of the genetic improvement program is discussed.

分类号： S9

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