| establishment of a bovine leukosis virus-free dairy herd. | a large dairy herd was established free of bovine leukosis virus (blv) infection at the us dairy forage research center, madison, wis. cattle introduced into the herd originated from blv-infected herds, but only those negative for blv antibodies by an agar gel immunodiffusion test were accepted there. cattle that were found to be seropositive after their arrival at the new facility were promptly removed. embryo transfer and artificial insemination were used to introduce new genetic stock into th ... | 1984 | 6321416 |