1. College of Animal Science, South China Agricultural University and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, Guangzhou, People's Republic of China
2. Key Laboratory of Animal Health Aquaculture and Environmental Control, Guangdong, Guangzhou, People's Republic of China
3. South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, People's Republic of China
4. USDA, Agriculture Research Service, Avian Disease and Oncology Laboratory, East Lansing, Michigan, USA
5. College of Science and Engineering, Jinan University, Guangzhou, People's Republic of China
6. Institute of Animal Science, Guangdong Academy of Agriculture Sciences, Guangzhou, People's Republic of China