Flies cause significant welfare harm in livestock through biting, annoyance, and disease transmission, with integrated fly management strategies protecting animal welfare throughout the summer season.
Fly welfare harm is continuous and cumulative during warm months: cattle pestered by face flies spend time bunching and head-swinging that reduces feeding time; sheep with blowfly strike suffer progressive tissue destruction. Individual welfare is affected hourly on farms without effective fly control. Integrated fly management — combining prevention (physical barriers, reduced manure accumulation) with treatment (targeted insecticides, pour-ons) — protects welfare more effectively and sustainably than reactive treatment alone. The welfare-productivity alignment makes fly control investment straightforward to justify.