HUANG Xin~1 YE Hong-xia~2 SHU Xiao-li~(2) WU Dian-xing~2(1.Institute of Animal Sciences and Veterinary Medicine,Zhejiang Academy of Agriculture Sciences,Hangzhou,Zhejiang 310021;2.IAEA Collaborating Center/Institute of Nuclear Agricultural Sciences,Zhejiang University,Hangzhou,Zhejiang 310029)