1. Department of Animal Wealth Development, Animal Breeding and Production, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
2. Department of Animal Wealth Development, Veterinary Genetics & Genetic Engineering, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
3. Department of Anatomy & Embryology, Faculty of Veterinary Medicine, Kafrelsheikh University, Zagazig, Egypt