Farm Animals

Sheep Ectoparasite Control and Welfare

External parasites including sheep scab, lice and keds cause significant welfare harm in sheep. Effective control through appropriate treatments protects flock health and individual welfare.

Key Facts

Sheep scab caused by Psoroptes ovis mites causes intense pruritus leading to severe fleece loss and skin damage
Scab is notifiable in some countries reflecting its serious welfare and economic impact
Louse infestation causes biting and irritation with affected sheep showing restlessness and fleece damage
Injectable macrocyclic lactones and plunge dipping with organophosphates treat most ectoparasites effectively
Biosecurity preventing introduction of infested sheep is the primary prevention strategy

Welfare Considerations

Sheep scab causes intense itching comparable to severe scabies in humans leading to exhaustion, weight loss and secondary infection through constant rubbing and biting. Severe untreated scab is a serious welfare emergency. Louse infestation causes significant but less acute discomfort. Regular monitoring for ectoparasites and prompt treatment when identified prevents serious welfare deterioration and controls spread within and between flocks.

What You Can Do

Monitor sheep for signs of ectoparasite infestation including rubbing, biting and fleece damage
Report suspected sheep scab to your vet and regulatory authorities immediately as it is notifiable in some regions
Implement treatment with appropriate products under veterinary guidance promptly on diagnosis
Quarantine and treat all purchased sheep before integration to prevent ectoparasite introduction
Work with neighbors and local farmers on area-wide control to reduce reinfestation pressure