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Experimental Eimeria bovis infection in calves: a histopathological study
Summary
This study details the intestinal lesions caused by Eimeria bovis infection in young Holstein calves. Steroid administration exacerbated the severe diphtheritic typhlitis and colitis, primarily driven by the parasite's sexual stages.
Area of Science:
- Veterinary Parasitology
- Bovine Pathology
Background:
- Eimeria bovis is a significant protozoan parasite causing coccidiosis in cattle.
- Intestinal damage in calves can lead to severe economic losses in the livestock industry.
Purpose of the Study:
- To characterize the intestinal lesions induced by experimental Eimeria bovis infection in Holstein calves.
- To investigate the impact of steroid administration on lesion development.
Main Methods:
- Eight male Holstein calves were infected with Eimeria bovis oocysts.
- Calves received steroid injections on specific days post-infection.
- Lesions were examined in the small and large intestines at various time points.
Main Results:
- Experimental Eimeria bovis infection resulted in diphtheritic typhlitis and colitis.
- Severe ileal lesions were observed, particularly in the terminal section.
- Intestinal mucosal damage was predominantly caused by the sexual stages of the parasite, leading to epithelial cell destruction and membrane formation.
Conclusions:
- Eimeria bovis infection causes significant intestinal pathology in calves.
- Steroid administration may influence lesion severity or progression.
- The sexual stages of Eimeria bovis are key contributors to the observed intestinal damage.