Screwworm Scare Puts Texas Animal Exports on Ice

A tiny parasite with an ugly appetite has managed to throw a wrench into livestock trade. Canada has suspended exports of several animal categories from Texas — including horses, pigs, cattle, bison, sheep, goats, and more — because of concerns about New World screwworm, according to the U.S. Department of Agriculture.

For folks who have never had the displeasure, New World screwworm is not your everyday nuisance fly. Its larvae feed on living tissue in warm-blooded animals, entering through wounds as small as a tick bite, a branding mark, or a newborn’s navel. Left unchecked, it can cause severe suffering and major economic damage. In livestock country, this is the sort of pest that makes veterinarians sit up straight.

The immediate impact is trade disruption. Ranchers and breeders who move animals across the U.S.-Canada border may face delays, lost sales, or extra testing and documentation. Even operations far from Texas should pay attention, because animal movement rules tend to ripple. One county’s concern can become another region’s paperwork before the coffee gets cold.

Practically speaking, this is a good week to revisit wound management, fly control, and animal inspection routines. Check calves, lambs, kids, and any recently worked animals closely. Keep records tidy. If you ship livestock, call ahead before loading the trailer — border requirements and buyer expectations can change faster than a summer thunderstorm.

The bigger lesson is that biosecurity is not just for big confinement barns or international airports. It starts at the gate, the chute, the trailer, and the fence line. A little vigilance now can save a whole lot of veterinary trouble later.