BLM Approves Continued Fertility Control on Pryor Mountain Wild Horse Range

The Bureau of Land Management (BLM) Billings, Montana, Field Office has released a decision that will allow for the continued use offertility controlon the Pryor Mountain Wild Horse Range. The decision record finding of no significant impact and the environmental assessment on which this decision is based can be found on theBillings Field Office website.

Fertility controlhas been used on the PMWHR in varying intensities and management applications since 2001. The currentfertility controlprotocol using ZonaStat-H (also known as liquid porcine zona pellucida [PZP]), began in 2011 and will expire after this season’s remote darting is complete. Currently, 70-80% of the mares are treated annually.

“We had a lot of constructive feedback and information provided to us from the public and some very productive discussions with individuals and groups like the Pryor Mountain Wild Mustang Center and The Cloud Foundation,” said Billings field manager Jim Sparks. “The Billings Field Office is excited to be on the cusp of nearly eliminating the need for wild horse removals due to the use ofPZP.”

The proposed action adopted by the decision record was developed based on results from the 2011-15fertility controlprotocol and past use of thePZPvaccine, which has been effective in managing the herd numbers. It is composed of a specific treatment prescription, including treating mares ages 2-4 and 10-20 years old, along with thresholds allowing for adaptive management.

Originally Posted By Bureau of Land Management