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DOI：10.3969/j.issn.1004-874X.2008.04.020
Author NameAffiliation
魏刚才, 郑爱武, 梁秀荣 河南科技学院动物科学系,河南,新乡,453003
新乡市畜牧局,河南,新乡,453000
辉县市畜牧局,河南,辉县,456000 
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