[1]Institute of Animal Science;
Chinese Academy of Agricultural Sciences;
Beijing 100193;
P.R. China;
[2]Institute of Zoology;
Chinese Academy of Sciences;
Beijing 100101;
P.R.China;
[2]Institute of Zoology;
Chinese Academy of Sciences;
Beijing 100101;
P.R.China;
[3]University of Chinese Academy of Sciences;
Beijing 100049;
P.R. China;