Sheep Fly Strike Prevention and Welfare Management

Flystrike (blowfly strike) is one of the most severe welfare emergencies in sheep production, and prevention programs dramatically reduce the incidence of this acutely painful condition.

Key Facts

Flystrike affects approximately 1-3% of UK sheep annually, with higher rates in humid conditions
Blowfly larvae burrow into living tissue, causing severe pain, toxemia, and rapid death within days
At-risk areas including the breech, back, and wounds require regular monitoring during fly season
Preventive treatments including insecticidal dips, sprays, and systemic treatments are effective
Mulesing of Merino sheep removes wool-bearing skin to reduce breech strike susceptibility but causes significant pain

Welfare Considerations

Flystrike causes extreme acute welfare harm. Larvae burrowing into living tissue is one of the most painful experiences a sheep can endure, and affected animals deteriorate rapidly. Early detection requires regular flock observation during high-risk periods. The welfare case for aggressive prevention — insecticidal treatment, wound management, breech inspection — is compelling. Mulesing remains controversial: it prevents flystrike welfare harm but causes significant procedural welfare harm. Pain-relieving mulesing protocols and genetic selection for low-susceptibility wool types are improving the welfare balance in mulesing programs.

What You Can Do

Support wool products from farms with documented flystrike prevention programs
Advocate for pain management requirements for any mulesing procedures
Choose non-mulesed or mulesed-with-pain-relief wool products when available
Learn about flystrike as one of the most severe acute welfare harms in sheep production