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Sheep-plaguing worm resisting common treatments
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April 9, 2021
A roundworm that plagues sheep grazing irrigated pastures has been found to be resistant to common classes of dewormers, according to a recently published report online in the Sheep & Goat Research Journal.
University of Wyoming Extension sheep specialist Whit Stewart says research by him and scientists at Montana State University and the University of Georgia that began in 2017 is a baseline resistance study for the warm season barber pole worm (
Haemonchus contortus) and associated deworming management practices across sheep flocks in the region.
The worm has a stripe that winds around it like a barber’s pole.
“To our knowledge, it is the first published estimate of barber pole worm resistance in the Intermountain West,” Stewart says. “We basically found that we are seeing the barber pole worm being resistant to our common classes of dewormers on flocks grazing irrigated acres in the region.”