The effect of grazing on a perennial veldt grass, subterranean clover pasture

The results of a grazing trial with Merino wether sheep on perennial veldt grass with subterranean clover are presented. During the four years 1944-45 to 1947-48 total pasture production under continuous grazing was almost identical with that under rotational grazing (one week's grazing followed by five weeks' rest). No consistent treatment differences were observed in sheep body-weight trends. In each year the weights increased during the growing season, remained stationary during early summer, and declined in late summer. The contribution of the perennial grass (Ehrharta calycina Sm.) declined rapidly with time, though more so under continuous grazing. This was associated with an increase in the proportion of subterranean clover in the sward. The lack of persistence of Ehrharta calycina is attributed to selective grazing, together with susceptibility to drastic defoliation. Alternative schemes for the use of this grass, involving restricted winter grazing, are suggested.