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C.Y. Wu, G.H. Zhao, Y.Q. Zhao, H. Liu, P.J. Zhang and D.K. Chen
Journal of Animal and Veterinary Advances 10 ( 5 ): 642 - 650 , 2011
X.Q. Jing, Y.Q. Zhao, C.C. Shang, Y.L. Yao, T.T. Tian, J. Li and D.K. Chen
Journal of Animal and Veterinary Advances 11 ( 4 ): 475 - 479 , 2012