Parental genetic effects evaluation of growth-related traits of red common carp in China |
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| Authors: | Cheng-Hui Wang Jun Wang Song-Ping Xiang Yao-Ping Lv Jian Wang and Xiao-Zhen He |
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| Institution: | (1) Key Laboratory of Aquatic Genetic Resources and Utilization, Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China;(2) Provincial Farm of Oujiang Color Common Carp, Longquan, Zhejiang, 323700, China;(3) School of Chemistry and Life Sciences, Lishui University, Lishui, Zhejiang, 323000, China |
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| Abstract: | Reciprocal differences have been observed widely for given traits in fish breeding programs, but maternal and paternal effects
and heritable extranuclear genetic effects have often been omitted in the evaluation of genetic variance. In this study, we
have applied a mixed genetic model to conduct a complete diallel cross using three varieties of red common carp (Cyprinus carpio L.), namely, C.
carpio. var. singuonensis, C. carpio var. wuyuanensis and C.
carpio var. color. Parental and direct (additive and dominance) genetic effects for growth-related traits at 8 and 20 months post-hatch were
analyzed. At 8 months post-hatch, only significant additive and dominance variances were observed, while maternal and paternal
variances were low and non-significant in the traits evaluated: body weight, total length, standard length, pre-dorsal height,
pre-dorsal width, caudal peduncle length, and caudal peduncle height. At 20 months post-hatch, with the exception of significant
additive and/or dominance variances, maternal variances were significant for the traits of body weight, pre-dorsal height,
pre-dorsal width, and caudal peduncle height, and the paternal variance was significant only for total length. The maternal
effects in the common carp had greater genetic influence on offspring than the paternal effects. Female C. carpio var. wuyuanensis were more suitable as brooders than males, but both female and male C. carpio var. color can be used as brooders according to breeding programs of improved traits. Cyprinus carpio var. singuonensis was the worst brooder of the three varieties of common carp evaluated. |
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