J.J. Ni, T.T. Ju and X.S. Piao
Journal of Animal and Veterinary Advances 11 ( 10 ): 1669 - 1673 , 2012
Q. Hu, F.L. Wang, X.S. Piao, J.J. Ni, X.M. Zhang and D.F. Li
Journal of Animal and Veterinary Advances 11 ( 13 ): 2333 - 2341 , 2012