1. Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013, China
4. Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China