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Bovine leucosis in Ireland
Annales De Recherches Veterinaires. Annals of Veterinary Research
|January 1, 1978
Summary
Bovine lymphosarcoma occurs rarely in cattle. A study found no evidence of Enzootic Bovine Leukosis (EBL) in tumor cases, but identified EBL in herds with imported Canadian Holsteins.
Area of Science:
- Veterinary medicine
- Oncology
- Epidemiology
Background:
- Lymphosarcoma is a rare cattle tumor, found at 2/100,000 slaughter rate.
- Enzootic Bovine Leukosis (EBL) is a notifiable disease since October 1977.
- Initial surveys found no EBL in tumor-affected herds.
Purpose of the Study:
- To investigate the incidence of lymphosarcoma in cattle.
- To determine the association between lymphosarcoma and Enzootic Bovine Leukosis (EBL).
- To survey herds with imported cattle for EBL.
Main Methods:
- Abbatoir surveys for lymphosarcoma incidence.
- Back-tracing of tumor cases to origin herds.
- Agar Gel Immunodiffusion (AGID) testing for EBL in herds.
- Serological surveys in herds with imported cattle.
Main Results:
- No multiple lymphosarcoma cases were found within herds.
- All tumor case origin herds tested negative for EBL.
- Seven herds with Canadian Holsteins tested positive for EBL.
- Limited spread of EBL infection was observed within affected herds.
Conclusions:
- Lymphosarcoma and EBL appear to be distinct in this cattle population.
- Imported cattle, specifically Canadian Holsteins, are a potential source of EBL introduction.
- EBL surveillance in herds with imported animals is crucial.