You can even work with as little as one acre. As long as you stick with one unit of measure (acres versus hectares), you are able to work with as much or as little land as you wish.
To determine the number of animal units you can graze on a piece of land us via this formula: Total Animal Units = (Pasture size [acres] x Stocking rate [AUM/acre]) / Length of grazing period (months) Therefore, as per our example, Total Animal Units = (100 acres x 1. 0 AUM/acre) / 4 months = 25 Animal Units.
To calculate, incorporating step 5: Animal Unit Equivalents = Number of AUs / (Actual animal weight / Animal unit weight); thus AUEs = 25 AUs / (1400 lb / 1000 lb) = 17. 86 AUEs. In other words, you can have 18 cows (weighing an average of 1400 pounds) grazing your 100-acre parcel of land for four months.