Ear tattooing as a method of spread of bovine leukosis virus infection.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000209:etiology*; D004423:Ear; D007938:Leukemia / Q000209:etiology / Q000662:veterinary*; D001909:Leukemia Virus, Bovine; D013653:Tattooing / Q000009:adverse effects / Q000662:veterinary*