College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, Henan Province, People's Republic of China.
Key Laboratory of Animal Biochemistry and Nutrition, Ministry of Agriculture and Rural Affairs, Henan Agricultural University, Zhengzhou, Henan Province, People's Republic of China.
International Joint Research Center of National Animal Immunology, Henan Agricultural University, Zhengzhou, Henan Province, People's Republic of China.