AMLs are often expressed as a range, such as 120 – 200.
In this example, horse #121 is excess, the beginning of overpopulation according to current management practices.
The high end of the range usually corresponds to around 20% of the authorized forage.
The management plan allows 200 wild horses and livestock equivalent to 800 horses.
If the current population is less than 5X AML, the HMA is not overpopulated from a resource viewpoint, but the ranchers won’t be able to access all of the AUMs on their permits until corrective actions are taken.
The AML range usually allows for a doubling of herd size between those actions.
A narrow range means little if any growth.
The new AML at Pryor Mountain, 107 – 120, implies heavy use of fertility control pesticides and sterilization of mares, synonymous with conservation in advocacy circles.
RELATED: BLM Releases Pryor Mountain Final Planning Documents.







