EN
On the basis of post-slaughter examinations there was assessed the dynamics of the nodular form of enzootic bovine leukaemia (EBL) occurrence in the Lower Salesia region in 1960—1974 and its distribution in Poland in 1984. There was paid attention to the reasons of EBL spreading, the percentage of infections in large-scale cowsheds, the relationship between the age of animals and the degree of a herd infection, and some problems associated with the control of the disease. In 36 large-scale cowsheds there were assessed 4499 cows using the AGID test. The index of infection in individual herds ranged from 12 to 82%. The process of cowsheds recovery was based on the healthy system of calves and heifers breeding. Calves, fed colostrum taken from their own mothers, were separated from udalt cows and fed milk-replacement liquids. The first serological assessments were performed in calves aged 4 months, that permitted for a quick elimination of infected animals. Consecutive examinations were carried out every 4 months until the recevery of a herd was stated.