Authors
1 Dept. of Theriogenology, Fac. Vet. Med., Assiut University
2 Dept. of Animal Hygiene and Zoonoses, Fac. Vet. Med., Assiut Univ.
3 Animal Health Research Institute Assiut Regional Laboratory
4 Dept. of Microbiology, Fac. Vet. Med., South Valley Univ.