Animal Husbandry and Feed Science ›› 2009, Vol. 30 ›› Issue (4): 12-12.doi: 10.12160/j.issn.1672-5190.2009.04.006
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CHEN Rui-li, HU Jun-hong, FENG Bao-jiang (1.Anyang Institute of Technology,Anyang 455000,China;2.Anyang Middle School No.20,Anyang 455000,China;3.Linzhou Vocational High School No.2, Linzhou 456500,China)