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WANG Yan-feng1,ZHANG Ding-hua1,CAO Zhi-gao1,YIN Ling1,GUI Qi-sheng2,ZHU Jin-feng1
(1.Department of Animal Science, Henan Vocational College of Agriculture,Zhongmu 451450,China;2.Henan Yuzheng Biological Technology Co., Ltd.,Zhongmu 451450,China)