[Examination of cattle for antibody against bovine leukemia virus: Examination in younger and older age group cattle (author's transl)].
D000367:Age Factors; D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D002417:Cattle / Q000276:immunology*; D001909:Leukemia Virus, Bovine / Q000276:immunology*; D012190:Retroviridae / Q000276:immunology*
D000914:Antibodies, Viral