Comparison of production variables of bovine leukemia virus antibody-negative and antibody-positive cows in two California dairy herds.
D000367:Age Factors; D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D002140:California; D002417:Cattle; D002418:Cattle Diseases / Q000276:immunology / Q000503:physiopathology*; D005260:Female; D007774:Lactation; D007938:Leukemia / Q000276:immunology / Q000503:physiopathology / Q000662:veterinary*; D001909:Leukemia Virus, Bovine / Q000276:immunology*; D011247:Pregnancy; D012098:Reproduction; D012190:Retroviridae / Q000276:immunology*
D000914:Antibodies, Viral