Immunocontraceptive vaccines such as PZP are currently being used in over 75 areas managed for wild horses and burros by the National Park Service, U.S. Forest Service and the Bureau of Land Management, according to the Final EA for management actions at the Marietta WBR. Go to page 26 in the pdf.
The Park Service shut off the darting program at Assateague Island in 2016.
The latest roundup and fertility control schedule shows 14 HMAs with fertility control programs.
Where else is it in use and who are the organizers?