title: [Etiology and prevention of respiratory diseases in calves in Bulgaria].
mesh_terms: D000818:Animals; D002031:Bulgaria; D002417:Cattle; D002418:Cattle Diseases / Q000209:etiology* / Q000382:microbiology / Q000517:prevention & control; D012141:Respiratory Tract Infections / Q000382:microbiology / Q000517:prevention & control / Q000662:veterinary*; D012698:Serologic Tests / Q000662:veterinary
vernacular_title: Kŭm etiologiiata i profilaktikata na respiratornite zaboliavaniia po teletata u nas