Stocking rate and days of grazing
Stocking comes down to forage on hand, how much of it the cattle can actually use, and how much they eat. South Dakota State University Extension works from 26 pounds of dry forage per animal unit per day, an animal unit being roughly a 1,000-pound cow, and about 25% harvest efficiency for moderate continuous grazing. The rest is trampled, fouled, left as residue or eaten by something else.
Run the arithmetic for one pasture: 80 acres carrying about 2,000 pounds of dry forage an acre is 160,000 pounds. At 25% harvest efficiency, 40,000 pounds are usable. Forty 1,300-pound cows eat about 1,350 pounds a day between them, so the pasture lasts about thirty days. Our stocking rate calculator does the same sum and lets you change each assumption.
Write the clipping or visual estimate into the same visit as the stocking call. Then the number you give the owner has its working attached, and next year’s walk has something to compare against.