The study aimed to analyze the effect of non-genetic factors on body measurements in Yili horse and estimate genetic parameters of body measurement traits.The 1 556 records about body measurement traits of 1-11 years old horse during 2005-2014 year were used to estimate effect of non-genetic factors on body measurement traits by least square variance analysis,the genetic parameters and heritabilities of body measurement traits and correlation among traits were estimated by REML by animal model.The results showed that the herd,age and birth year had significant effect on body height,body length,chest girth and cannon circumference(P＜0.01),the sex had significant effect on body height,body length and cannon circumference(P＜0.01)but had no significant effect on chest girth(P＞0.05).The heritability of body height,body length,chest girth and cannon circumference were 0.87,0.67,0.40 and 0.52,respectively.Body length and chest girth had the highest genetic correlation,the correlation coefficient was 0.93.Body height and cannon circumference had the highest phenotypic correlation,the correlation coefficient was 0.65.Body height was significantly related in phenotype to body length,chest girth and cannon circumference(P＜0.01),respectively.Body length was significantly related in phenotype to chest girth and cannon circumference(P＜0.01),respectively.Cannon circumference was significantly related in phenotype to chest girth(P＜0.01).The results will provide a theoretical basis for the genetic evaluation of body size traits in Yili horses.%旨在探讨非遗传因素对伊犁马体尺性状的影响及各体尺性状的遗传参数,本研究利用新疆伊犁昭苏县2005-2014年年龄在1～11岁的伊犁马体尺性状的1 556条记录,对影响伊犁马体尺性状的非遗传因素进行最小二乘方差分析,并利用动物模型约束最大似然(Restricted maximum likelihood,REML)方法估计体尺性状的遗传力及性状之间的遗传相关.结果表明,场、年龄和出生年度效应对伊犁马体高、体长、胸围和管围性状均有极显著影响(P＜0.01),性别效应对伊犁马的体高、体长和管围有极显著影响(P＜0.01),但是对胸围性状影响不显著(P＞0.05).体高、体长、胸围和管围的遗传力分别为0.87、0.67、0.40和0.52;体长与胸围的遗传相关最高,相关系数为0.93,体高与管围的表型相关最高,相关系数为0.65;体高与体长、胸围和管围分别呈现极显著表型相关(P＜0.01),体长与胸围和管围分别呈现极显著表型相关(P＜0.01),管围和胸围也呈现极显著表型相关(P＜0.01).上述研究为伊犁马今后在遗传评定与遗传参数估计中设计合理的统计分析模型提供了必要的参考依据.
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