[1] Yangzhou Univ, Coll Anim Sci & Technol, Yangzhou, Peoples R China
[2] Chinese Acad Agr Sci, Inst Grassland Res, Hohhot, Peoples R China
[3] Gansu Agr Univ, Gansu Prov Key Lab Aridland Crop Sci, Res & Testing Ctr, Lanzhou, Peoples R China
[4] Yangzhou Univ, Testing Ctr, Yangzhou, Peoples R China