INVESTIGATIONS FOR THE IMMUNOPROPHYLAXIS OF BOVINE COCCIDIOSIS

In a fattering farm for calves with clinical coccidiosis suspensions o f oocysts were won, in which the species Eimeria zuernii predominant w as occured with 94,0 per cent and 95,5 per cent. After the radiated at tenuation with 250 Gy immunoprophylactical investigations were unterta ken on a small group of calves. The application of 30 000 attenuated o ocysts caused in comparison to fullvirulent oocysts a significant redu ced oocysts output and showed pathological and histological a slight r eaction on the intestine. The effectiveness of the vaccination was rev ealed after the challenge in the output of oocysts of immunized claves reduced to 92,2 per cent and 100 per cent comparing to non-immunized controls.