Fig. 5. The effect of residual patch state on the maximum sustainable yield that may be achieved and the defoliation interval required to achieve this (solid lines) as predicted by a model that seeks optimal solution for all combination of residual patch state and the timing of harvest. (a) the combinations of residual patch state and defoliation intervals that emerge (separate point for each of a range of stocking rates) when animals are assumed to graze patches either at random (solid dots), or in strict sequence (open circles) and in (b) the same for rotational grazing (open symbols, 30 d with animals not present: 1 d grazing) compared to continuous grazing (solid symbols). Arrows show the direction of increasing stocking rate. After Parsons and Chapman (2000).