What is an Animal Unit (AU) and Animal Unit Month (AUM)?

An Animal Unit (AU) is standardized as one 1,000 lb beef cow (with or without a nursing calf up to 6 months). One AUM represents the amount of forage needed to sustain one AU for one month (~780 to 800 lb of dry matter).

Why is grazing harvest efficiency only 25% on native range?

Of 100% standing forage, 50% must remain as residue for plant health and erosion control ("Take half, leave half"). Of the remaining 50%, livestock consume roughly half and waste/trample/foul the other half, resulting in 25% net intake.

How do calves affect stocking rate?

A nursing calf consumes negligible forage for the first 60 days, but by 3–7 months consumes forage equating to 0.2 to 0.4 Animal Units in addition to the cow.

What is the difference between stocking rate and carrying capacity?

Carrying capacity is how many cattle the land can support long-term without damaging forage. Stocking rate is what you actually place. Keep stocking rate at or below carrying capacity in most years.

How does forage production affect how many cattle I can keep?

Usable forage = acres × yield × harvest efficiency. Lower drought yields cut supportable head count unless you shorten the graze period or add feed.

How can I tell if I am overstocking?

Short residual forage, more weeds, cattle traveling farther to graze, earlier hay need, and weaker calf weights are common signals. Recalculate with current yields and destock or supplement before plants are damaged.

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