EN
The study was performed on 60 Holstein-Friesian cows and 41 heifers. The results on the comparison of the efficacy of an ELISA and fluorescent antibody test (FAT) in the diagnosis of bovine leukosis, indicated that the FAT technique enables the identification of a greater number of bovine leukaemia virus (BLV) carriers than the ELISA, thus suggesting that the FAT may be more useful than the ELISA for diagnosis of BLV infection.