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Influence of parental sample sizes on the estimating genetic parameters in cultured clam Meretrix meretrix based on factorial mating designs

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Acta Oceanologica Sinica 2016年第6期35卷 42-49页

作者： LIANG Bingbing YUE Xin WANG Hongxia LIU Baozhong Key Laboratory of Experimental Marine Biology Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266200China

The precise and accurate knowledge of genetic parameters is a prerequisite for making efficient selection strategies in breeding programs.A number of estimators of heritability about important economic traits in many marine mollusks are available in the literature,however very few research have evaluated about the accuracy of genetic parameters estimated with different family ***,in the present study,the effect of parent sample size for estimating the precision of genetic parameters of four growth traits in clam *** by factorial designs were analyzed through restricted maximum likelihood（REML） and *** results showed that the average estimated heritabilities of growth traits obtained from REML were 0.23-0.32 for 9 and 16 full-sib families and 0.19-0.22 for 25 full-sib *** using Bayesian inference,the average estimated heritabilities were0.11-0.12 for 9 and 16 full-sib families and 0.13-0.16 for 25 full-sib *** with REML,Bayesian got lower heritabilities,but still remained at a medium *** the number of parents increased from 6 to 10,the estimated heritabilities were more closed to 0.20 in REML and 0.12 in Bayesian *** correlations among traits were positive and high and had no significant difference between different sizes of *** accuracies of estimated breeding values from the 9 and 16 families were less precise than those from 25 *** results provide a basic genetic evaluation for growth traits and should be useful for the design and operation of a practical selective breeding program in the clam ***.

关键词： Meretrix meretrix parental sample sizes genetic parameter factorial design restricted maximum likelihood Bayesian inference

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