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It is recommended to vaccinate replacement ewe lambs before this age, and to buy in replacements from an OJD-free or vaccinated flock, to reduce the spread of the disease.

If you run a sheep flock, chances are you may well be harbouring one of the UK’s ‘iceberg’ diseases, ovine Johne’s disease. Farmers and vets at a recent roundtable looked at the impact and what could be done to conquer it.