Farmed Sheep Flystrike Prevention and Welfare

Blowfly strike is a painful and potentially fatal condition affecting sheep throughout the UK, requiring both preventive management and rapid treatment to minimize welfare harm.

Key Facts

Flystrike occurs when blowflies lay eggs in soiled or wounded wool, with larvae hatching and causing progressive tissue destruction within hours.
The UK loses approximately 3% of its sheep to flystrike annually, representing over a million animals affected.
Affected sheep show behavioral signs of distress including restlessness, nibbling at affected areas, and progressive weakness as tissue damage advances.
Preventive measures include dagging (removing soiled wool), strategic shearing, and insecticide treatment - with timing determined by seasonal fly activity.
Mulesing - surgical removal of breech skin to reduce wool and soiling - was developed in Australia but is not practiced in the UK, where alternative management approaches are used.

Welfare Considerations

Flystrike welfare harm is severe: the maggots digest living tissue, causing pain that worsens progressively until treated or death occurs. Animals can be badly affected within 24 hours of strike, making daily monitoring during the high-risk season (May-October) a welfare necessity, not just good practice. Early detection and treatment - removing maggots, cleaning wounds, and applying appropriate insecticide - are the critical welfare responses. Prevention through good fleece management and appropriate use of licensed preventive products reduces strike incidence. The welfare challenge of flystrike illustrates the direct connection between stockpersonship quality and animal welfare outcomes in sheep farming.

What You Can Do

Support sheep producers who implement rigorous flystrike monitoring during the high-risk season.
Advocate for welfare standards that require daily monitoring of sheep for flystrike during summer.
Engage with wool and lamb product certification that includes flystrike prevention protocols.
Support research into flystrike-resistant sheep genetics as a long-term welfare solution.