Feed competition reduces heritable variation for body weight inLitopenaeus vannamei

文献类型： 外文期刊

第一作者： Luan, Sheng

作者： Luan, Sheng;Qiang, Guangfeng;Cao, Baoxiang;Luo, Kun;Meng, Xianhong;Chen, Baolong;Kong, Jie;Luan, Sheng;Qiang, Guangfeng;Cao, Baoxiang;Luo, Kun;Meng, Xianhong;Chen, Baolong;Kong, Jie

作者机构：

期刊名称：GENETICS SELECTION EVOLUTION （ 影响因子：4.297； 五年影响因子：4.925 ）

ISSN： 0999-193X

年卷期： 2020 年 52 卷 1 期

页码：

收录情况： SCI

摘要： Background Competition is a common social interaction among shrimp and depending on its intensity, it can affect heritable variation and response to selection. Little is known about the variance of indirect genetic effects (IGE) under competitive and non-competitive conditions in shrimp. In this study, we used extended mixed linear models to estimate genetic parameters for the direct genetic effect (DGE) and IGE on body weight inLitopenaeus vannameiraised under ad libitum (AF, non-competitive environment) and restricted (RF, competitive environment) feeding regimes. Results Estimates of heritabilities for body weight obtained with a traditional animal model (i.e. without accounting for IGE) were 0.11 +/- 0.09 under AF and 0.25 +/- 0.11 under RF. With extended animal models that accounted for IGE, the corresponding estimates for body weight were 0.07 +/- 0.08 and 0.34 +/- 0.11. Thus, heritabilities were higher under the RF regime than under the AF regime, regardless of whether IGE was accounted for or not. The log-likelihood ratio test revealed significant IGE under the RF regime. Although estimates of indirect genetic variance were low (0.0023 +/- 0.0013 for AF and 0.0028 +/- 0.0012 for RF), they contributed substantially to the total heritable variance: 66.8% for AF and 692.2% for RF. The total heritable variance was smaller under the RF regime (0.7 +/- 1.3) than under the AF regime (5.8 +/- 2.6) because of the high contribution of the negative covariance between DGE and IGE (- 7.03). Estimates of the correlation between DGE and IGE were 0.32 +/- 0.47 under AF and - 0.93 +/- 0.15 under RF, those of DGE and IGE for body weight between both regimes were 0.94 +/- 0.07 and 0.67 +/- 0.20, respectively, and those of IGE for body weight with DGE for survival were - 0.12 +/- 0.22 under AF and - 0.58 +/- 0.20 under RF. Conclusions These results indicate that strong competitive interactions occurred under the RF regime inL. vannamei. Significant reranking and variation in IGE of individuals were observed between the two feeding regimes. Strong competitive interactions reduced the total heritable variation for body weight when food was restricted. These results indicate that the extent of competition amongL. vannameidepends on the feeding regime applied and that this competition affects the genetic basis of body weight.

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