Maedi-visna is a progressive lentiviral disease of sheep causing chronic wasting, respiratory failure and neurological signs with significant welfare implications.
MV causes progressive welfare deterioration over months to years, with affected sheep experiencing chronic respiratory distress, wasting and weakness. Welfare priorities include regular screening to identify and remove infected animals, participation in MV accreditation schemes, strict biosecurity to prevent introduction to clean flocks, and prompt euthanasia when animals reach a welfare endpoint.