Farm Animal Welfare

Sheep Headfly and Summer Welfare

Head fly causes chronic irritation and wound infection in sheep during summer, significantly affecting welfare across pastoral systems.

Key Facts

Hydrotaea irritans deposits larvae in wounds around the head and face of sheep
Wounds from head fly attract further flies in a welfare-worsening cycle
Chemical treatment with pour-ons provides protection for 4-8 weeks
Breeding selection for reduced wool on the head reduces fly strike risk
Affected animals show head shaking, rubbing, and reduced grazing time

Welfare Considerations

Head fly causes constant irritation and painful wound development in affected sheep. The distraction from grazing and constant defensive behavior represents a significant welfare burden during affected periods.

What You Can Do

Implement preventive head fly control before the summer fly season
Monitor flocks for early signs of head fly wound formation
Support breeding programs selecting for natural resistance to head fly