1. Department of Poultry Science, Mississippi State University, Mississippi State, Mississippi, USA
2. Department of Biomedical Sciences, City University of Hong Kong, Kowloon, Hong Kong, China
3. Mountainous Area Research Institute of Hebei Province, Hebei Agricultural University, Baoding, Hebei, China
4. Agricultural Technology Innovation Center in Mountainous Areas of Hebei Province, Baoding, Hebei, China
5. Department of Food Science, Nutrition, and Health Promotion, Mississippi State University, Mississippi State, Mississippi, USA
6. Prestage Department of Poultry Science, North Carolina State University, Raleigh, North Carolina, USA