1. Animal and Poultry Nutrition Department, Desert Research Center, El-Matareya, Cairo, Egypt
2. Department of Animal and Fish Production, Faculty of Desert and Environmental Agriculture, Matrouh University, Matrouh, Egypt
3. Animal Production Department, Faculty of Agriculture, Tanta University, Tanta, Egypt
4. Genetics Department, Faculty of Agriculture, Tanta University, Tanta, Egypt
5. Animal and Fish Production Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt