Affiliation: | Shandong Academy of Agricultural Sciences, Jinan, China (J. Wang, L. Guo, Y. Du, S. Ren, J. Li, Y. Zhang, Y. Fan, B. Huang, J. Wu); ;Shandong Key Laboratory of Animal Disease Control and Breeding, Jinan (J. Wang, P. Zhao, L. Guo, Y. Du, S. Ren, J. Li, Y. Zhang, B. Huang, J. Wu); ;Shandong Agricultural University, Tai-an, China (J. Wang, Y. Liu, S. Liu) |