1. Department of Poultry, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
2. Department of Forensic Medicine and Toxicology, Veterinary Medicine Faculty, Zagazig University, Zagazig, Egypt
3. Division of Pathology, Indian Veterinary Research Institute, Izatnagar, Bareilly (Uttar Pradesh) India
4. Department of Poultry Science, University of Georgia 30602, USA