1. Department of Theriogenology and Reproductive Biotechnology, College of Veterinary Medicine and Bio-safety Research Institute, Jeonbuk National University, Iksan, Korea.
2. Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, Sudan University of Science and Technology, Khartoum, Sudan.
3. Subtropical Livestock Research Institute, National Institute of Animal Science, Rural Development Administration, Jeju-si, Korea.