Six month old calves kept on pasture were experimentally infected three times with O. ostertagi and 15 days later each infection was abbreviated with oxfendazole. After the immunisation period the animals were allowed to graze naturally contaminated pasture. The results obtained clearly show that immunised animals produced significantly fewer eggs than the non-immunised controls. The protection obtained was associated with increased daily liveweight gains.
This work presents serological evidence of cattle ostertagiosis in the Lower Silesia Region (Poland), based on the measurement of antibodies in bulk tank milk (BTM) samples. It represents the first evidence of this parasite examined with the use of the ELISA test and milk samples in Poland. The prevalence of Ostertagia ostertagii antibodies was determined in BTM from 32 dairy cattle herds. Antibodies to O. ostertagii were demonstrated in all herds. The optical density ratio (ODR) varied from -0.088 to 1.024. The mean ODR value in the examined region was 0.53.
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