Sheep Welfare and Flystrike Prevention

Blowfly strike — maggot infestation of living sheep — causes one of the most painful conditions in veterinary practice and remains a significant welfare challenge in the sheep industry.

Key Facts

Flystrike affects an estimated 80% of sheep flocks in the UK in affected years
A struck sheep can die within days if the infestation is not treated
Maggots feeding on living tissue cause extreme pain measurable through cortisol and behavioral indicators
Preventive insecticides applied at shearing are effective but require correct timing and coverage
Breeding for reduced breech wrinkle, good fly resistance, and tail length reduces flystrike susceptibility

Welfare Considerations

Flystrike represents one of the most severe welfare emergencies in sheep farming. Once struck, sheep show pain behaviors including isolation, reduced mobility, and apparent distress. Without rapid treatment, maggot infestation spreads to deeper tissues causing tissue destruction and toxemia. Prevention requires vigilance, good flock inspection routines, and strategic preventive treatment — practices that require time investment. Welfare codes in the UK require twice-daily inspection during high-risk periods, but compliance and enforcement are inconsistent across farms.

What You Can Do

Support sheep welfare codes requiring regular inspection and rapid treatment of struck animals
Advocate for flystrike monitoring to be included in farm assurance welfare audits
Support sheep breeding programs selecting for low flystrike susceptibility traits
Choose lamb certified by higher-welfare assurance schemes with parasitic disease management requirements