Milk production was assessed in 145 cows coming from two farms designated as N and TG. By means of ELISA test it was found that 52 cows were infected with BLV and 37 were uninfected at the N farm, while at the TG farm 27 cows were seropositive and 29 seronegative when evaluated by the AGID test. It was determined on the N farm milk production was 10,7 1 per day in leukemic cows and 11,9 in control cows. The average yield of milk was 1,17 1 lower than that in control cows. The mean percentage of fat was 3,158 in leukemic cows and 3,418 in aleukemic cattle. At the TG farm the findings were different; the mean milk production from infected cows was 10,06 1 while from non-infected it was 9,78 1. Milk production in one lactation period was 10,8% lower in infected cows of the N farm than that in the control group. This kind of relation, however was not found at the TG farm.
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