What Do the AUM Numbers Tell You About an HMA?

Consider these data from Warm Springs HMA in southeast Oregon:

Warm Springs AUM Summary-1

What can you infer from these figures, omitting the portion for wildlife?

  • The AML is 202 (2,424 ÷ 12)
  • Privately owned livestock receive 89% of the forage (19,392 ÷  (2,424 + 19,392))
  • Wild horses receive 11% of the forage (2,424 ÷  (2,424 + 19,392))
  • Livestock receive eight times more forage than horses (19,392 ÷ 2,424)
  • The forage allocation for livestock would support 3,232 cow/calf pairs over a six month grazing season (19,392 ÷ 6)
  • The forage allocation for livestock would support 1,616 wild horses (19,392 ÷ 12)
  • The HMA can support 1,818 wild horses (202 + 1,616)
  • The AML represents 11% of the carrying capacity of the HMA (202 ÷ 1,818)

You don’t have a horse problem at Warm Springs HMA, you have a ranching problem.

RELATED: Warm Springs Horses Get Short End of Stick.

Cattle Grazing on Hill-1

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