›› 1999, Vol. 19 ›› Issue (4): 231-231.

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  1. 1.中国农业科学院哈尔滨兽医研究所，哈尔滨 150001；2.黑龙江省富锦市畜牧局
  • Received:1999-06-10 Online:1999-01-25 Published:2013-03-19

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