1. College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu 225009, People’s Republic of China
2. International Joint Research Laboratory in Universities of Jiangsu Province of China for Domestic Animal Germplasm Resources and Genetic Improvement, Yangzhou, Jiangsu 225009, People’s Republic of China
3. Department of Veterinary Biomedical Sciences, Botswana University of Agriculture and Agriculture and Natural Resources, Ebele, Private Bag 0027, Gaborone, 0000Botswana
4. Biomedical Research Institute, Darfur University College, Nyala, Sudan