Iceberg diseases of ewes

This manual provides a concise reference guide to five infectious diseases of sheep that members of the sheep industry have identified as important: Border disease (BD), caseous lymphadenitis (CLA), Maedi Visna (MV), ovine paratuberculosis or ovine Johne’s disease (OJD) and ovine pulmonary adenocarcinoma (OPA). However, awareness of these diseases is low, with a recent survey suggesting fewer than 5% of farmers screen for them routinely.

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