Animal Husbandry and Feed Science ›› 2010, Vol. 31 ›› Issue (10): 24-24.doi: 10.12160/j.issn.1672-5190.2010.10.012
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LI Yan-ling,WU Ren-hong,YANG Yu-rong(1.Zhengzhou Agricultural and Forestry Science Institute,Zhengzhou 450005,China;2.Huanghe Science & Technology College,Zhengzhou 450005,China)