Stocking Rate

What is Stocking Rate?

Stocking rate is the number of animal units (AU) assigned to a given area of pasture, typically expressed as AU per acre or acres per AU. One animal unit equals one 1,000 lb cow with or without a calf. Stocking rate is the single most important management decision in grazing systems — it determines the balance between forage supply and animal demand.

Setting the correct stocking rate requires matching forage production (lbs dry matter/acre) with animal requirements (lbs DMI/head/day). Overstocking leads to overgrazing, pasture degradation, reduced forage quality, soil erosion, and poor animal performance. Understocking wastes forage potential and reduces income per acre.

For example, a pasture producing 4,000 lbs of forage DM per acre, with 50% utilization (cows eat half, trample/waste the rest), provides 2,000 lbs of usable forage per acre. A 1,000 lb cow consuming 25 lbs DMI/day for 150 grazing days needs 3,750 lbs of forage. This pasture can support about 0.53 AU per acre (2,000 ÷ 3,750), or roughly one cow per 1.9 acres.

Adaptive multi-paddock (AMP) grazing and rotational grazing systems can increase effective stocking rate by 30–50% compared to continuous grazing, by allowing pasture rest and recovery periods.