The Seroprevalence of Chlamydia abortus in Montana Domestic Rangeland Sheep Varies by Breed, Flock and Herding Practices

In total, 95 (12.6%) of the sheep tested had C. abortus anti-major outer membrane protein (anti-MOMP) antibodies. Seropositivity varied significantly by breed, flock, whether the animals were herded and whether the tested ewe had already lambed that season prior to sampling. These data provide insight into the impacts of OEA in Montana domestic rangeland sheep and will better inform local producers about whether additional treatments and preventative measures should be put in place.