银蓝水貂重要经济性状的遗传参数估计

Estimation of Genetic Parameter for Growth and Fur Trait in Sliver Blue Mink

本研究以银蓝水貂为材料,对6个世代的1686只水貂的生长记录进行统计分析,分析性别及年份对水貂体重、体长、针毛长、绒毛长和针、绒毛长比率的表型趋势影响。利用多性动物模型约束最大似然法(REML)估计以上水貂生产性状的遗传力和遗传相关。在模型中考虑了年份和性别固定效应,随机效应为个体的加性效应。结果表明,各性状遗传力均较高,其中体重为0.41,体长为0.53,针毛长为0.53,绒毛长为0.52,针、绒毛长比率为0.52。除针、绒毛长比率与其他性状间呈表型负相关(-0.218、-0.178、-0.074、-0.425)外,各性状间均为表型正相关(分别为0.289、0.882、0.869、0.806、0.788、0.930)。体长与绒毛长、针、绒毛长比率呈现遗传负相关(-0.941、-0.983),其他均为较强的遗传正相关,分别为0.983、0.731、0.972、0.981、0.622、0.992、0.641、0.987。

Samples were obtained from Dalian Ming Wei Marten Industry Company, based on 1686 sliver blue mink of six generation from 2005 to 2011. The phenotypic trends of body weight, body length, guard hair length, under fur length, and the rate of two hairs were analyzed by year and sex. Genetic parameter of growth and fur traits in the sliver blue mink was estimated with multi-traits animal model. The fixed effects, which were included the year, sex effects and the animal additive genetic effects were calculated. The results showed as following： Heritability estimates for body weight body length, guard hair length, under fur length and the rate two hair lengths was 0.41, 0.53, 0.53, 0.52 and 0.52. Except for the phenotypic correlation between the rate of two hair lengths and body weight, body length, guard hair length and under fur length were negatively （-0.218,-0.178, -0.074,-0.425）, among the other four traits were positively （0.289, 0.882, 0.869, 0.806, 0.788, 0.930）. The genetic correlation between body length and under fur length and the rate of two hair length were negatively （-0.941, -0.983）, others were positively （0.983, 0.731, 0.972, 0.981, 0.622, 0.992, 0.641, 0.987）.