1. Department of Veterinary Surgery; Faculty of Veterinary Medicine; Kafrelsheikh University; Kafr El-Sheikh 33516 Egypt
2. Department of Internal Medicine and Infectious Diseases; Faculty of Veterinary Medicine; Mansoura University; Mansoura 35516 Egypt
3. Department of Anatomy, Histology and Embryology; Faculty of Veterinary Medicine; University of Tripoli; Tripoli 13662 Libya