1. Department of Physiology; Faculty of Veterinary Medicine; Zagazig University; Zagazig 44519 Egypt
2. Department of Theriogenology and Biotechnology; College of Veterinary Medicine and the Research Institute for Veterinary Science; Seoul National University; Seoul 151-742 Korea
3. Department of Theriogenology; Faculty of Veterinary Medicine; Kafrelsheikh University; Kafrelsheikh 33516 Egypt
4. Designed Animal and Transplantation; Institute of Green Bio Science Technology; Seoul National University; Seoul 232-916 Pyeongchang Korea