1. Department of Animal Nutrition, College of Animal Sciences and Technology, Northwest A & F University, Yangling, Shaanxi Province, P.R. China;
2. Department of Clinical Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu Province, P.R. China;
3. Department of Physical Education, Shaanxi Normal University, Xian, Shaanxi Province, P.R. China;
4. Department of Veterinary Microbiology, Faculty of Animal Husbandry and Veterinary Sciences, Sindh Agriculture University, Tandojam, Sindh Province, Pakistan;
5. Department of Pharmaceutical Analysis, China Pharmaceutical University, School of Pharmacy, Nanjing, Jiangsu Province, P.R. China