1. Department of Animal Nutrition, College of Animal Sciences and Technology, Northwest A&F University, Yangling, China, 712100
2. Faculty of Veterinary and Animal Sciences, Lasbela University of Agriculture, Water and Marine Sciences, Uthal, Balochistan, Pakistan 3800
3. College of Science Shantou University, Shantou, Guangdong, P.R. China
4. Institute of Animal and Dairy Sciences, Faculty of Animal Husbandry, University of Agriculture Faisalabad, Pakistan
5. Poultry Department, Faculty of Agriculture, Zagazig University, 44511 Zagazig, Egypt
6. College of Life Sciences, Northwest A&F University, Yangling, 712100, China