| Abstract: | This investigation aimed to examine coccidia infection in diary cattle in Yuzhong,Gansu province.An investigation was carried out on the Holstein calves less than one year old in six large-scale dairy farms.A total of 234 fecal samples were examined,and oocysts were identified to the species level on the basis of morphological features after positive samples were mixed thoroughly with 2.5% potassium dichromate solution.The results showed that the prevalence rate of coccidia in Holstein calves reached 46.15%.The average prevalence rate of the calves under 3 months old was 52.43%,the 4 to 6 months old calves was 37.50% and the 7 to 12 months old calves was 43.37%.Seven species of Eimeria coccidians and one species Isospora sp.including Eimeria bovis,Eimeria auburnensis,Eimeria zuernii,Eimeria alabamensis,Eimeria subspherica,Eimeria ellipsoidalli,Eimeria canadensisi,were identified in the investigation,and Eimeria bovis,Eimeria auburnensis,Eimeria zuernii were the dominant species.In conclusion,the prevalence rate of coccidiosis in dairy cattles in Yuzhong,Gansu province was high.Therefore,appropriate strategies and measures should be taken to control coccidiosis prevalence in dairy cows in this region. |
