الفترة:
Subjects: Bulls; Cattle; Cows
Subjects: Chickens; Diseases
Subjects: Chickens; Diseases; Immunology
Subjects: Chickens; Diseases; Poultry
Subjects: Diagnosis; Diseases
Subjects: Immunity
Subjects: Egypt; Pathogens; Pathology; Diagnosis
Subjects: Chickens
Subjects: New zealand; Diseases