Livestock

Dag and Breech Flystrike Welfare in Sheep

Breech flystrike is one of the most painful conditions in sheep, caused by blowfly larvae on soiled wool. Prevention through dag removal and chemical protection is a welfare priority.

Key Facts

Over 80% of flystrike cases originate in the breech area
Dag accumulation from loose faeces dramatically increases flystrike risk
Blowfly larvae burrow into living tissue within hours of egg laying
Affected sheep suffer acute and chronic pain from tissue destruction
Prevention using insect growth regulators reduces flystrike by over 90%

Welfare Considerations

Breech flystrike is a severe welfare emergency. Affected sheep suffer intense pain from larvae consuming tissue while still alive. The condition can be fatal within days without treatment. Regular dagging to remove soiled wool, selective breeding for clean breech conformation, and timely application of preventive treatments at high-risk periods are the most effective welfare interventions. Daily observation during the fly season is essential.

What You Can Do

Dag sheep regularly, especially before the fly season
Apply preventive insect growth regulator treatments at appropriate times
Check sheep daily during warm damp weather when fly risk is highest
Breed from ewes with cleaner breech conformation where possible