Tropical Grasslands (1986) Volume 20, 120127
SELECTION OF PLANT SPECIES BY CATTLE GRAZING NATIVE MONSOON TALLGRASS PASTURE AT KATHERINE, N.T.
CSIRO Division of Tropical Crops and Pastures, PMB 44, Winnellie, N.T. 5789, Australia.
The defoliation of pasture species by cattle was monitored for two wet-dry seasonal cycles in recently burnt native monsoon perennial tallgrass pastures. Three uncleared 50 ha paddocks were used. Alternate halves of each paddock were burnt each dry season. Relative defoliation ratings were combined with relative abundance (frequency of occurrence) values to derive, for each pasture species, a selectivity index, whose values could range from – 1 to + 1, with zero indicating non-selective grazing.