Animal Husbandry and Feed Science ›› 2012, Vol. 33 ›› Issue (3): 32-32.doi: 10.12160/j.issn.1672-5190.2012.03.013
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JIA Yi-feng, MIAO Pei (Jiyuan Institute of Animal Health Inspection in Henan Province, Jiyuan 454650, China)