An estimation of genetic parameters of growth traits in juvenile turbot ( Scophthalmus maximus L.) using parental molecu
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An estimation of genetic parameters of growth traits in juvenile turbot (Scophthalmus maximus L.) using parental molecular relatedness HU Yulong1, GUAN Jiantao1, 2, MA Yu1, KONG Jie1, WANG Weiji1* 1 Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China 2 College of Marine Life, Ocean University of China, Qingdao 266003, China
Received 23 September 2014; accepted 8 January 2015 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2016
Abstract
The estimation of genetic parameters has played an important role in animal selective breeding for growth traits. Recently studies show that molecular markers can be incorporated into genetic evaluations. In order to improve the performance of an incomplete pedigree (i.e, only parents are known) in the genetic evaluations, 12 microsatellite markers have been applied in the estimation of the genetic parameters for body weight in a farmed population (n=1 890) of juvenile turbot (Scophthalmus maximus L.). A new relatedness called parental molecular relatedness (PMR) is estimated based on results of genotyping of 48 parents (31 males, 17 females) with microsatellites markers. The feasibility of PMR in estimation of genetic parameters is verified by comparison with pedigree related (PR) which is obtained from a complete pedigree. The results demonstrate that a high correlation (0.872) between them is found. Heritabilities are estimated using the PMR (0.52±0.13) and PR (0.55±0.22) with the same animal model. A cross-validation shows that the predictive abilities of models using the PMR and the PR are identical (0.81). From that, a conclusion can be made that PMR and PR predicted genetic values equally well in a population of juvenile turbot. Therefore PMR can be applied as an alternative of the PR when only parents are known. However, for a better performance, more markers and more families should be included in a further study. Key words: parental molecular relatedness, pedigree relatedness, turbot, genetic parameters Citation: Hu Yulong, Guan Jiantao, Ma Yu, Kong Jie, Wang Weiji. 2016. An estimation of genetic parameters of growth traits in juvenile turbot (Scophthalmus maximus L.) using parental molecular relatedness. Acta Oceanologica Sinica, 35(2): 126–130, doi: 10.1007/s13131015-0643-6
1 Introduction Turbot, Scophthalmus maximus L., is a marine finfish with a fast growth and strong tolerance to a cold water temperature and is the most widely cultivated commercial flatfish around the world with the highest annual aquaculture production (Lei et al., 2012). From its introduction into China in 1992 to now, its farming has developed into one of the dominant mariculture industries in China with an annual production of more than 60 kt (Lei et al., 2012). In aquaculture, the growth is an important trait with commercial interests. The faster growth can reduce the duration of the rearing cycle so to lower costs. However, the optimization of breeding programs is developed with the accurate and reliable estimation of g
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