1. State Key Laboratory of Animal Genetics Breeding & Reproduction, College of Animal Science and Technology Northwest A&F University Yangling P. R. China
2. National Beef Cattle Improvement Center Northwest A&F University Yangling P. R. China
3. Faculty of Science, Biology Department University of Hail Hail Saudi Arabia
4. State Key Laboratory of Plateau Ecology and Agriculture Qinghai University Xining P. R. China
5. Department of Livestock Management, Breeding and Genetics The University of Agriculture Peshawar Pakistan