Over the years 1983 to 1984 two-hundred and sixty-five bulls were examined during mass occurrence of bovine cysticercosis in one farm; out of this number 67 animals (25.3%) were confirmed autopsically as infected with cysticercosis. Counterimmunoelectrophoresis was used to examine the serum of slaughtered animals by help of two antigens--Taenia saginata and Taenia crassiceps. With T. saginata the sensitivity amounted to 44.8% and the specificity to 86.4%, with T. crassiceps to 28.3% and to 89.9%.