Aiming to verify bovine leukaemia (BL) occurrence in Curraleiro cattle breed, sera of 1051 animals were sampled from Goias (n=11) and Tocantins (n=12) states. BL serological diagnosis was performed by agar gel immunodiffusion method (AGID). The total occurrence rate was 21.1% (222/1051). In Tocantins it was 27.8% (136/489) occurrence was observed, higher value than in Goias, where 15.3% (86/562) occurrence was found. The serum reactivity was higher in females than in males, 23.3% (198/852) and 11.8% (23/195), respectively, and in animals older than 48 months old.
Epidemiology; leucosis; naturalized bovine