1. Animal Nutrition Institute Sichuan Agricultural University Chengdu 611130 P. R. China
2. Key Laboratory for Animal Disease‐Resistant Nutrition of the Ministry of Education of China Sichuan Agricultural University Chengdu 611130 P. R. China
3. Key Laboratory of Animal Disease‐Resistant Nutrition of Sichuan Province Sichuan Agricultural University Chengdu 611130 P. R. China
4. School of Life Sciences Sichuan Agricultural University Chengdu P. R. China
5. College of Science Sichuan Agricultural University Xin Kang Road, Yucheng District Ya'an 625014 P. R. China
6. College of Veterinary Medicine Sichuan Agricultural University Chengdu P. R. China
7. State Key Laboratory of Food Science and Technology Nanchang University Nanchang 330047 Jiangxi China