1. Poultry Production Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt
2. Dairy Science Department, National Research Centre, Giza, Egypt
3. Animal and Fish Production Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt
4. Department of Animal and Veterinary Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Sultanate of Oman