Farm Animals

Farmed Sheep Ectoparasite Resistance Screening

Resistance to acaricides in sheep ectoparasites including sheep scab mite and blowfly is an increasing welfare and management concern.

Key Facts

Sheep scab mite (Psoroptes ovis) resistance to some dip formulations has been reported
Blowfly resistance to various insecticide classes is developing in some regions
Resistance monitoring through treated flock surveillance enables early detection
Rotating between chemical classes and integrating non-chemical approaches reduces resistance development

Welfare Considerations

Loss of effective ectoparasite control leaves sheep vulnerable to scab and blowfly strike - both causing severe suffering. Resistance management through rotation and monitoring preserves the efficacy of available treatments. Welfare and long-term chemical efficacy are aligned.

What You Can Do

Support sheep health programmes that include ectoparasite resistance monitoring
Advocate for resistance surveillance reporting requirements in farm assurance schemes
Choose lamb from farms demonstrating integrated ectoparasite management approaches