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ZHANG Gui-shan1,XUE Jing-long1,SUN Li-min1,ZHAO Jia1,XU Jing1,2,JIANG Huai-zhi1
(1.College of Animal Science and Technology,Jilin Agricultural University,Changchun 130118,China;2.Changchun University of Science and Technology,Changchun 130600,China)