An inverse relationship between stand density and understory productiv- ity has been reported in numerous papers. Intuitively, one would expect maximum understory productivity at the onset of the plantation, and a decrease to a lower minimum after a more or less precipitous decline at intermediate ages [Jameson 1967; Lewis et al. 1983]. Animal stocking rate should follow this very same pattern. However, light grazing occurred in early years to avoid excessive tree damage [see also Adams 1975; Lewis et al. 1983; Lewis 1985]. Unless thinnings are prescribed, canopy closes at later ages, pasture growth is severely affected, and heavy grazing is precluded.