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BILLINGS — Four bull bison that migrated out of Yellowstone National Park were killed by state livestock agents Wednesday — the first to be killed by the government this year under a contentious policy meant to prevent the spread of disease to livestock.
Many of Yellowstone’s bison carry brucellosis, which can cause pregnant cows to miscarry. There have been no recorded transmissions of the disease in the wild from bison to cattle.
Three of the bison killed Tuesday were captured north of West Yellowstone and sent to slaughter, said Department of Livestock Executive Officer Christian Mackay.