the only rancher I personally know that has dealt with brucellosis was in the GYE and admitted he just didn’t want to spend the money to vaccinate despite knowing he had potential for contact. He was very quick to blame elk and want more ways to hunt/kill them on his property, especially bulls in the fall. To me it seemed much easier for him to just pay up and vaccinate but that probably would cut into his beer and cigarette budget
He may not want to sell his livestock then, as the Dept of Livestock will be significantly unimpressed.
Brucellosis
liv.mt.gov