Cattle Stocking Rate (AUM)
Available forage (production x area x utilization), animal-unit-months of carrying capacity, head supported, and grazing days for a herd, by animal class. Per the USDA NRCS National Range and Pasture Handbook Ch. 6.
Formula and source
Available forage = production (lb/acre) x area (acres) x utilization. AUMs = available forage / 780 lb (one animal-unit-month). Head supported for 30 days = AUMs / AU-equivalent. Grazing days for a herd = available forage / (herd x AU-equivalent x 26 lb/day).
USDA NRCS National Range and Pasture Handbook Chapter 6 (stocking rate) by name.
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