Utilization data and residual measurements are important in evaluating the effects of grazing and browsing on rangeland. Utilization measures the percentage of annual herbage production that has been removed. It is generally the percentage of available forage (weight or numbers of plants, twigs, etc.) that has been consumed or destroyed. Utilization is expressed in terms of the current year's production removed. Residual measurement is the determination of herbage material or stubble height left.