1. Physiology Department, Faculty of Veterinary Medicine Minia University El‐Minia Egypt
2. Physiology Department, Faculty of Veterinary Medicine Beni‐Suef University Beni‐Suef Egypt
3. Small and Large Ruminant Farm, Faculty of Agriculture Minia University El‐Minia Egypt
4. Histology Department, Faculty of Veterinary Medicine Beni‐Suef University Beni‐Suef Egypt