BLM Logo
Cody Field Office
Release Date: 01/20/11
Contacts: Sarah Beckwith    

BLM Proposes Fertility Control for McCullough Peaks Herd

The Bureau of Land Management (BLM) Cody Field Office proposes the implementation of a field darting fertility control program for the McCullough Peaks Wild Horse Herd Management Area (HMA).

Beginning in February 2011, the BLM proposes to treat select mares over one year of age with the fertility drug porcine zona pellucida (PZP) in order to slow the population growth on the range and work towards maintaining the appropriate management level (AML) of 70-140 wild horses in the McCullough Peaks HMA. Maintaining the AML will help prevent deterioration of rangelands and balance wild horses with other public rangeland resources and uses.

The goal of utilizing field darting to apply the PZP is to reduce the need for large and costly helicopter gather and removal operations in the future.

An environmental assessment (EA) was prepared to analyze the potential environmental impacts of the fertility control program. The EA is available for review and comment on the BLM website at

Comments should be postmarked by Feb. 22, 2011 and mailed to Tricia Hatle, BLM-Cody Field Office, 1002 Blackburn Street, Cody, WY 82414, or emailed to

For more information, please contact BLM Wild Horse Specialist Tricia Hatle at 307-578-5900, or stop by the Cody Field Office at 1002 Blackburn Street.

The BLM manages more than 245 million acres of public land, the most of any Federal agency. This land, known as the National System of Public Lands, is primarily located in 12 Western states, including Alaska. The BLM also administers 700 million acres of sub-surface mineral estate throughout the nation. The BLM's mission is to sustain the health, diversity, and productivity of America’s public lands for the use and enjoyment of present and future generations. In Fiscal Year 2015, the BLM generated $4.1 billion in receipts from activities occurring on public lands.

Cody Field Office   1002 Blackburn Street      Cody, WY 82414  

Last updated: 01-20-2011