Abstract
Six experimentally infected calves were slaughtered at 15 days post infection (dpi) (Group A), 20 dpi (Group B), 25 dpi (Group C) and the intestinal mucosa was examined for pathological changes. The affected part of the intestine was removed, opened and examined for macroscopic findings. The animals studied showed lesions of varying severity. The gross pathology revealed no remarkable abnormal findings in calves of group A. Redness of the mucosa of the caecum and colon in six calves of group B and C was noted. There were no first generation schizonts evident grossly. The main characteristic under the light of microscope of the intestinal sections taken from the calves examined during the late prepatent period were mild inflammatory infilteration of the mucosa and increased cellular debris, parasitic structures were identified from small and large intestine. The caecum and colon showed particularly high levels of infection.
Highlights
Eimeria bovis and E. zuernii are the economically most important of the twenty-one or so coccidial species infecting cattle [1]
At least nine species of coccidia have been reported in cattle which include Eimeria subspherica, E. zuernii, E. alabamensis, E. elipsoidalis, E. cylindrica, E. bovis, E. condenses, E. bukidonensis and E. auburnensis) [2]
Similar findings were reported by Mundt et al [9] who conducted studies in E. zuernii infection model in order to investigate the pathology of E. zuernii coccidiosis
Summary
Eimeria bovis and E. zuernii are the economically most important of the twenty-one or so coccidial species infecting cattle [1]. At least nine species of coccidia have been reported in cattle which include Eimeria subspherica , E. zuernii , E. alabamensis , E. elipsoidalis, E. cylindrica , E. bovis, E. condenses , E. bukidonensis and E. auburnensis) [2]. All Eimeria spp. share a similar monoxenous life cycle with aninternal (parasitic) and external (environmental) phase. They are strictly host specific and develop within cells at certain sites of the intestinal mucosa. Temperature and other environmental factors the oocysts sporulate and may reach infectivity within a week. Keeping in view the importance of disease in calves, this research project was designed to describe the lesions associated with experimental E. bovis infection in cattle and attempts to elucidate the pathogenesis of this protozoal disease
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