Farm Animals

Farmed Cattle Horn Fly and Welfare

Horn fly infestations in outdoor cattle cause significant welfare harm through blood-feeding, disrupted grazing, and energy diversion to defensive behaviour.

Key Facts

Horn flies can cause up to 70 blood meals per animal per day
Fly avoidance behaviour including bunching and restlessness reduces grazing time by up to 25%
Production losses and welfare compromise are correlated with fly burden
Fly control methods include pour-on insecticides, fly tags, and biological control
Natural predators of fly larvae can be supported through reduced insecticide use

Welfare Considerations

Horn fly infestations cause chronic blood loss, pain from bites, and significant energy diversion to avoidance behaviour. This reduces feed intake and grazing efficiency, causing welfare harm that compounds over the fly season. Integrated fly management that reduces dependence on insecticides while controlling burden protects both cattle and ecosystems.

What You Can Do

Support integrated fly management reducing insecticide use
Advocate for fly burden thresholds as welfare audit criteria
Choose beef from farms with documented fly management programmes