[Contribution to the etiology of ball tumors in hens].
D000818:Animals; D002006:Brucellosis / Q000662:veterinary*; D005534:Foot Diseases / Q000662:veterinary*; D009369:Neoplasms / Q000209:etiology*; D011201:Poultry Diseases
Beitrag zur Atiologie der Ballengeschwülste beim Huhn.