Herding the U.S. cattle industry toward a paradigm shift in parasite control

Area of Science:

• Veterinary Parasitology
• Anthelmintic Resistance
• Livestock Management

Background:

• Current cattle nematode control predominantly uses macrocyclic lactones (MLs).
• Over-reliance on MLs has led to significant selection pressure for resistant nematode populations.
• Reported ML resistance in U.S. cattle is a recent phenomenon, raising questions about its emergence.

Purpose of the Study:

• To address the growing issue of bovine anthelmintic resistance.
• To explore the implications of ML resistance for U.S. cattle producers and advisors.
• To identify barriers and facilitators for shifting parasite control paradigms.

Main Methods:

• Literature review and synthesis of current knowledge on anthelmintic resistance in cattle.
• Analysis of factors influencing producer and advisor adoption of new parasite control strategies.
• Discussion of the role of stakeholders, including pharmaceutical companies, in promoting sustainable anthelmintic use.

Main Results:

• Anthelmintic resistance in cattle is a complex issue driven by historical management practices.
• Producers are resistant to change without clear evidence of alternatives' value.
• Existing knowledge gaps among practitioners and economic incentives for pharmaceutical companies hinder progress.

Conclusions:

• A paradigm shift in U.S. cattle parasite control is necessary due to anthelmintic resistance.
• Overcoming resistance requires targeted education, practical demonstrations, and economic analyses.
• Collaboration among stakeholders and clear communication are crucial for influencing producer behavior and promoting sustainable practices.