Yuhua Ding, Defa Li, Xiangshu Piao, Jingdong Yin and Jianjun Xing
Journal of Animal and Veterinary Advances 3 ( 8 ): 490 - 496 , 2004
Yufan Kang, DeFa Li, JianJun Xing, P. J. McKinnon, P. Thacker and Xiuguo Shang
Journal of Animal and Veterinary Advances 3 ( 11 ): 740 - 748 , 2004