[Li, F.; Liu, W.; Liu, Y.; Dai, R. S.] Hunan Agr Univ, Coll Vet Med, Changsha 410128, Hunan, Peoples R China.
[Lin, R. Q.; Zhu, X. Q.] S China Agr Univ, Coll Vet Med, Guangzhou 510642, Guangdong, Peoples R China.
[Tan, Y. M.] Ctr Qual Quarantine & Examinat Livestock, Changsha 410006, Hunan, Peoples R China.
[He, D. S.] Hunan Profess & Tech Coll Biol, Changsha 410128, Hunan, Peoples R China.
[Zhu, X. Q.] S China Agr Univ, Coll Vet Med, 483 Wushan St, Guangzhou 510642, Guangdong, Peoples R China.