Chuan-Sheng Zhang, Li-Ying Geng, Yang-Qing, Wen-Jin Zhu, Qiu-Yue Wang, Xiang-Zhai Zhang, Hong-Nuan Sun, Xiao-Song Li, Rui-Zao Liu and Xiao-Hui Liu
Journal of Animal and Veterinary Advances 10 ( 18 ): 2343 - 2348 , 2011