Farm Animal Welfare

Sheep Flystrike Emergency Response: Time-Critical Welfare

Blowfly strike in sheep is a rapidly deteriorating welfare emergency requiring immediate recognition and treatment to prevent severe suffering and death.

Key Facts

Lucilia sericata (green bottle fly) is the primary cause of sheep flystrike in the UK
Flies lay eggs in soiled or damp wool, and larvae hatch within 12-24 hours
Larvae burrow into skin, releasing toxins that cause tissue death and systemic illness
Affected sheep can die within 3-5 days if untreated
High-risk periods are warm, humid weather from April to October
Dagging (removing soiled wool), chemical preventives, and breed selection reduce risk
Insecticide treatments applied to at-risk areas provide protection for 8-16 weeks

Welfare Considerations

Flystrike causes severe, escalating suffering - the pain of larvae feeding on living tissue combined with toxin-induced systemic illness creates one of the most acute welfare emergencies in sheep farming. Affected sheep are visibly distressed, show abnormal posture and self-directed biting, and deteriorate rapidly. Prevention is far superior to treatment: regular inspection, dagging, and preventive chemicals applied in advance of fly season can eliminate most cases.

What You Can Do

Inspect sheep daily during warm weather, especially around the tail and breech
Apply veterinary-approved preventive treatments before the fly season begins
Dag and shear sheep regularly to remove damp, soiled wool
Seek immediate veterinary treatment if any sheep shows signs of strike
Record flystrike incidents to identify high-risk animals for targeted management