Affiliation: | From the ‡College of Animal Science and Technology, Yangzhou University, 225009 Yangzhou, China.;the ¶Poultry Institute, Chinese Academy of Agricultural Sciences, 225009 Yangzhou, China.;the ‖ Department of Animal and Avian Sciences, University of Maryland, College Park, Maryland 20740, and ;the §Anatomy and Embryology Department, College of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt |