BILLINGS, Mont. (AP) — Government workers are set to begin hazing hundreds of wild bison back into Yellowstone National Park after capturing a small group of the animals for use in a birth control study.

Montana state veterinarian Marty Zaluski says 10 bull bison were captured Tuesday near West Yellowstone. Seven were later released and three turned over to U.S. Department of Agriculture researchers.

The government is studying whether birth control can rein in the park's burgeoning buffalo herds and reduce its rate of disease.

Thousands of migrating bison have been shipped to slaughter in the last decade to prevent transmissions of the disease brucellosis to cattle.

Workers on Wednesday plan to start driving roughly 400 bison back into Yellowstone.

They're making way for cattle being brought into the West Yellowstone area to graze.