Sheep Flystrike Prevention and Welfare

Blowfly strike (flystrike) causes intense suffering in affected sheep. Prevention through effective flock management and appropriate chemical treatment is a fundamental welfare responsibility for sheep farmers.

Key Facts

Blowfly strike occurs when blowflies (primarily Lucilia sericata in the UK) lay eggs on sheep, usually in soiled wool
Maggots hatch within 24 hours and begin consuming living tissue, causing progressive skin destruction
Affected sheep experience intense pain and distress - behavioural signs include stamping, restlessness, and attempts to bite the affected area
An untreated sheep can die from systemic toxaemia within days of a severe strike
Risk factors include soiled wool (dag), wounds, footrot, and warm humid weather that accelerates fly activity
Prevention includes dagging (removing soiled wool), chemical prevention using organophosphates or insect growth regulators, and selective breeding for smooth-bodied wool genetics
Electronic monitoring tools can detect at-risk periods when fly activity is high
Treatment requires removal of all maggots and wound management alongside chemical kill of remaining larvae

Welfare Considerations

Flystrike causes one of the most intensely distressing conditions in sheep farming. The experience of having living tissue consumed by maggots while still alive causes acute, severe pain that is clearly evident in affected animals' behaviour. Untreated strike progresses from painful to fatal within days. The preventability of the condition makes the welfare obligation clear - farmers who do not implement adequate prevention programmes allow entirely avoidable suffering. Dagging, appropriate chemical prevention at high-risk periods, and regular inspection during the fly season are all achievable practices that can dramatically reduce flystrike incidence. Early detection and rapid treatment are critical when prevention fails.

What You Can Do

Implement a dagging and wool management programme to remove soiled wool from high-risk areas before fly season
Use chemical prevention treatments (organophosphates or insect growth regulators) at appropriate risk periods
Inspect all sheep daily during high-risk periods (April-October) for early signs of strike
Treat affected sheep immediately - remove all maggots and apply appropriate wound treatment
Consider selective breeding for smooth-bodied sheep breeds with less soiling and fly strike risk
Support welfare standards that require documented flystrike prevention programmes as an audit requirement