Animal Husbandry and Feed Science ›› 2010, Vol. 31 ›› Issue (10): 37-37.doi: 10.12160/j.issn.1672-5190.2010.10.018
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XU Bing,YAO Hua,LIN De-gui(1.College of Veterinary Medicine,China Agricultural University,Beijing 100193,China;2.Veterinary Department,Beijing University of Agriculture,Beijing 102206,China)