我国每年都从国外引进大量种猪.引种时供种方所提供的种猪遗传评估信息的真实性与加入国外遗传评估体系(如NSR)的有效性值得探讨.本研究以从美国引种并且又加盟美国NSR的某国家级核心育种场为例,针对达目标体重日龄、活体背膘厚、活体眼肌面积、估计瘦肉率等4个性状,进行了系统化的相关分析.结果表明:引种时NSR提供的遗传评估信息真实但用途不大.在达目标体重日龄上,NSR估计的育种值与自行估计值呈极显著负相关,意味着根据NSR的结果进行选择,结果可能背道而驰;其他性状均为极显著正相关.但是,因为选择指数由这些性状的育种值共同加权组合而成,1个性状的估计育种值存在问题,将导致整个指数不可靠,这意味着不能盲目进行跨国评估.造成这一结果的原因是遗传与环境的互作,但对此有必要做进一步分析.%China has been importing enormous numbers of pigs abroad.However,whether the information offered by the exporters is reliable and whether participating in foreign breeding evaluation systems (NSR,etc.) are controversial issues.Taking one national level core breeding farm as an example which had imported pig from USA and then been a member of NSR,this study made systematic correlation analysis for four traits including "Days to 115kg","Backfat thickness","LoinMuscle Area" and "Predicted Percent Lean",and the results shown that.The breeding values offered by NSR is real,but it is not useful.For the trait of "Days to 115 kg",there seems to be a significant negative correlation between the breeding values estimated by NSR and by our method for imported ones and their progenies,which means that the results of selection based on our methods are probably opposite to the results according to NSR evaluation system.But for the other three traits,the coefficients of relationship are positively significant.However,as the selection index is composed of the sum of the weights of breeding values of "days to 115kg" and other traits,the whole index will be unreliable.Therefore,this is to say that we cannot blindly participate in the international evaluation system.When it comes to the reason of the results,it may be the interaction between genotype and environment.And further analysis is still needed to validate this hypothesis.
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