EN
The application of sensitive methods, enabling the detection of early infections and to diagnose the bovine leukemia virus (BLV), which ensures the eradication of this virus from herds. The aim of this study was to compare the PCR test with the IMF method for BLV diagnosis. The study involved 59 Holstein-Friesian cows aged 3-7 years and 53 heifers aged 2-6 months. Statistically significant differences were observed with respect to the effectiveness of the PCR and IMF methods during the first month after calving in cows and in older group heifers. The results of this comparison indicate that the IMF method permits the identification of a greater number of BLV carries than the PCR test. In addition, IMF may be more useful for diagnosing BLV infections than PCR.