1. Department of Animal production, College of Food and Agriculture Sciences; King Saud University; Riyadh Saudi Arabia
2. Department of Theriogenology, Faculty of Veterinary Medicine; Zagazig University; Sharkia Egypt
3. Department of Physiology, Faculty of Veterinary Medicine; Zagazig University; Zagazig Egypt
4. Department of Animal Wealth Development, Faculty of Veterinary Medicine; Zagazig University; Sharkia Egypt