BLM seeks comment on wild horse fertility control in Stewart Creek Herd Management Area



BLM Office:

Rawlins Field Office

Media Contact:

Courtney Whiteman

RAWLINS, Wyo.The Bureau of Land Management is seeking comments on a draft environmental assessment to analyze the impacts of applying fertility control to wild horse mares within the Stewart Creek Herd Management Area. The proposed fertility control would begin in winter 2021-2022 and continue through 2031. Fertility control would help maintain the Stewart Creek Herd within its appropriate management level of 125-175 wild horses. The method of fertility control would be through remote darting, using liquid porcine zona pellucida, GonaCon-Equine or PZP-22 into selected mares over one year old. The proposed action should help prevent deterioration of the rangelands and help maintain a thriving natural ecological balance. 

The draft EA is available to the public at our ePlanning site. The public comment period is open until Jan. 17, 2022. Comments will be accepted electronically through the ePlanning link listed above or by mail at:

Bureau of Land Management
P.O. Box 2407
Rawlins, WY 82391

For additional information regarding the proposed fertility control project, please contact Eddie Vandenburg, Wild Horse and Burro specialist, at 307-328-4262 or at

The BLM manages more than 245 million acres of public land located primarily in 12 western states, including Alaska, on behalf of the American people. The BLM also administers 700 million acres of sub-surface mineral estate throughout the nation. Our mission is to sustain the health, diversity, and productivity of America’s public lands for the use and enjoyment of present and future generations.