Farmed Animals

Blowfly Strike and Sheep Welfare

Blowfly strike is one of the most painful conditions in sheep, causing severe welfare harm that is largely preventable with good management.

Key Facts

Blowfly strike affects up to 3% of UK sheep annually, causing severe welfare harm
Flies lay eggs in soiled, damp, or damaged skin areas and larvae cause tissue destruction
Strike causes intense pain, rapid deterioration, and death if untreated
Preventive strategies include flystrike treatments, crutching, and regular inspection
Climate change is extending the blowfly season in the UK, increasing risk

Welfare Considerations

Blowfly strike causes some of the most intense and acute suffering of any sheep disease. Larvae penetrating living tissue cause pain that drives affected sheep to become withdrawn and stop eating. Prompt detection through regular inspection and immediate treatment are essential. Prevention through chemical treatments, wool management, and fly population control significantly reduces the welfare burden of this devastating condition.

What You Can Do

Support welfare standards requiring regular sheep inspection during fly season
Advocate for veterinary access to effective fly prevention products
Raise awareness about blowfly strike recognition and first response
Support research into sustainable fly prevention strategies
Encourage farmers to develop and follow written blowfly management plans