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LIU Xi-ping1,SUI Mei-xia2,XU Zhong-xiang1,WANG Zong-wei1,ZHANG Ru-lei1
(1.Shouguang Animal Husbandry and Veterinary Authority,Shouguang 262700,China;2. Key Laboratory of Biochemistry and Molecular Biology in Universities of Shandong,College of Biological and Agricultural Engineering,Weifang University,Weifang 261061,China)