Pasture Area Needed per Head of Cattle

Pasture area per head of cattle

Ranchers measure stocking in AU (Animal Unit) per hectare, with 1 AU pegged at 450 kg of live weight. To find the area you need, divide: area (ha) = AU / stocking rate. Brazilian field numbers vary a lot. A degraded pasture barely holds 1–2 AU/ha, a well-managed one reaches 2–4 AU/ha, and rotational Voisin grazing can push 6–8 AU/ha. Put 100 head in a feedlot and roughly 0.5 ha of corral does the job; turn those same 100 head loose on extensive pasture and you're looking at 30–50 ha, which forage and rainfall decide. The catch is that high stocking only holds up with forage management, fertilization and rotation behind it. Skip that work and the grass thins out, dragging the real carrying capacity down year after year.

Applications

Comes up in extensive beef ranching and dairy planning, in ILPF (crop-livestock-forest integration) and pasture-recovery work, when sizing a herd, and when proving compliance with the Plano ABC for low-carbon agriculture.

FAQ

What is an Animal Unit (AU)? One AU is 450 kg of live weight, about one adult cow. Younger or smaller animals count as a fraction, so a 225 kg calf is 0.5 AU.

How do I raise the stocking rate of my farm? Correcting the soil with lime and phosphorus, switching to improved forage like Brachiaria or Panicum, splitting the pasture into paddocks and rotating the animals can triple what a degraded pasture supports.

Does it vary by region? It does. Rainfall and forage productivity differ across the Pantanal, the Cerrado and the Amazon, so check EMBRAPA Gado de Corte for reference values that fit your area.