LI Dong-chun1,YAN Xi-wu1, HUO Zhong-ming2, YAO Tuo2, SUN Xin1, ZHANG Guo-fan3
1.Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, Dalian Ocean University, Dalian 116023, China; 2. College of Fisheries,Ocean University of China, Qingdao 266003, China; 3. Research and Development Center of Marine Biotechnology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China
Abstract: Shell length in different growth stages was measured and genetic parameters including response to selection, realized heritability and genetic gains were analyzed in two generations of Manila clamRuditapesphilippinarumstrain with cow-like spots for shell length under 1% sustained selection pressure. The results showed that average shell length in every growth stage was found to be larger in the selected groups than in the control groups. Response to selection values of F2were 1.98 in larvae, 0.72 in juveniles, and 0.64 in spats, with an average of 1.19 and response to selection values of F31.10 in larvae, 0.68 in juveniles, and 0.74 in spats, with an averages of 0.90. In the F2generation the realized heritability was found 0.43 in larvae, 0.16 in juveniles, and 0.14 in spats, with an average of 0.26 while in F3generation 0.41 in larvae, 0.26 in juveniles, and 0.28 in spats,with an averages of 0.34. Genetic gains at the three stages were 4.79%, 17.81%, and 13.27% in F2generation with an average of 10.78% and 5.60%, 4.28%, and 16.30% in F3generation, with an average of 7.94%. Total genetic gains of two generation successive selection were 10.73%, 15.56% and 29.34%, with an average of 16.59%.The findings prove that this method is feasible and that the improvement potentiality is still found in this clam population.
李冬春, 闫喜武, 霍忠明, 姚托, 孙欣, 张国范. 高选择压力下蛤仔奶牛蛤品系两个世代连续选择的选择反应和现实遗传力[J]. 大连海洋大学学报, 2014, 29(1): 5-10.
LI Dong-chun, YAN Xi-wu, HUO Zhong-ming, YAO Tuo, SUN Xin, ZHANG Guo-fan. RealizedheritabilityandresponsetosustainedselectionforshelllengthintwogenerationsofManilaclamRuditapesphilippinarumstrainwithcow-likespotsunderhighselectionpressure. Journal of Dalian Ocean University, 2014, 29(1): 5-10.