Flies cause significant welfare problems in cattle including wound fly strike, eye disease, and chronic irritation that reduces productivity and wellbeing.
Fly pressure causes chronic, continuous irritation that significantly reduces cattle welfare during warm months. Cattle under high fly loads spend hours each day in defensive behaviors — bunching, tail switching, head shaking, and seeking shade or water — that displace grazing time and cause weight loss. The welfare impact is not dramatic like a disease outbreak but is pervasive and persistent. Effective fly control through integrated pest management reduces this chronic burden. Wound fly strike, when it occurs, causes extremely rapid and severe welfare deterioration — wounds can be extensively damaged within 24-48 hours of infestation. Regular inspection of cattle for wounds and prompt treatment are essential welfare practices.