Department of Livestock Reports Brucellosis Affected Herd in Gallatin County

On Wednesday December 24, the Montana Department of Livestock (MDOL) received confirmation that an animal from a Gallatin County herd within Montana’s Designated Surveillance Area (DSA) tested positive for brucellosis. This is the second detection of brucellosis in livestock in Montana in 2025. The herd has been placed under quarantine, and an epidemiological investigation is ongoing. A brucellosis disease investigation includes looking at animal movement and contact tracing with the affected herd. The investigation may look as far as three years back into a herd’s history to ensure the disease is not present in any other livestock herds. In this...

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