New World Screwworm: Protecting Your Sheep & Goats Starts with Preparation

New World Screwworm: Protecting Your Sheep & Goats Starts with Preparation

New World Screwworm (NWS) is one of the most destructive parasites affecting livestock, and every sheep producer should be prepared. Although it has been eradicated from the United States in the past, continued monitoring and rapid response are critical to keeping our flocks safe.

Unlike common flies that feed on dead tissue, New World Screwworm larvae feed on the living flesh of animals. Even small wounds from shearing, ear tagging, castration, tail docking, or lambs and kids can attract flies and quickly become serious infestations if left untreated.

What Should Sheep & Goat Producers Do?

The best defense is prevention and early detection.

• Inspect your flock or herd regularly, especially after any procedure that creates a wound.

• Treat newborn lambs and kids' navels promptly and monitor them during their first days of life.

• Establish a relationship with your local veterinarian before an emergency occurs.

• Keep accurate treatment records and follow recommended withdrawal times.

• Schedule management practices during cooler months when fly activity is lower whenever possible.

If you notice unusual behavior, foul odors, visible maggots, or wounds that aren't healing properly, contact your veterinarian and state animal health officials immediately. Quick action can save animals and help prevent the spread of this devastating pest.

Prevention Is Easier Than Treatment

Good facilities and proper animal handling make routine inspections and wound care much easier. Whether you're working sheep through a handling system, trimming feet, or processing lambs, reducing stress and allowing for close observation can help catch problems before they become emergencies.

At Sydell, we believe that quality livestock equipment and sound management practices go hand in hand. Safe handling systems, lambing pens, and well-designed working facilities can make regular health checks faster, safer, and more efficient for both producers and animals.

Download the Complete Producer Guide
New World screwworm (NWS) Info & Resources American Sheep Industry 

Find out more from the U.S. Department of Agriculture.
New world Screw worm USDA

For detailed information on identification, prevention, treatment considerations, and emergency response procedures, we encourage every producer to review the USDA 

Being prepared today can protect your flock tomorrow