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Published May 07, 2010, 02:57 PM

2 bison in study killed, aggressive behavior cited

BILLINGS, Mont. — A state official says two bison that were part of a federal animal disease study were shot and killed after they wandered into an off-limits area north of Yellowstone National Park and could not be turned back.

BILLINGS, Mont. — A state official says two bison that were part of a federal animal disease study were shot and killed after they wandered into an off-limits area north of Yellowstone National Park and could not be turned back.

Steve Merritt with the Montana Department of Livestock says the bison woke up angry and aggressive just outside the park after they had been tranquilized by U.S. Department of Agriculture researchers collecting bison semen.

The researchers were studying whether the animals pose a risk of transmitting the disease brucellosis to cattle.

The bison traveled 10 miles to an area of Yankee Jim Canyon where no bison are allowed because of disease concerns.

Merritt says a Department of Livestock official decided to shoot the bison after efforts to turn them back failed.

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