Tropical Grasslands (1989) Volume 23, 75–79

LIVE WEIGHT GAIN FROM FOUR NITROGEN FERTILIZED GRASSES GRAZED OVER THE GROWING SEASON IN COASTAL SOUTH-EAST QUEENSLAND

R.M. JONES and T.R. EVANS

CSIRO Division of Tropical Crops and Pastures, 306 Carmody Road, St. Lucia, Queensland 4067 Australia.

Abstract

Animal production was measured over the growing season (October to June) from 4 grass pastures fertilised with 170 kg N/ha/year in coastal south-east Queensland from 1982 to 1987. The pastures were grazed at 7 yearling steers/ha from mid spring until mid autumn and at 3.5 steers/ha thereafter until animals lost weight in winter. Animal production was similar from pastures of Setaria sphacelata cv. Kazungula, and cv. Narok, Setaria sphacelata var. splendida CPI 15899, and Chloris gayana cv. Callide, with an average production over 6 years of c. 820 kg LWG/ha. There was much more variation in animal production between years than there was between the different grasses. There was a gradual invasion of Pennisetum clandestinum, particularly in plots of Callide rhodes grass which did not persist as well as the Setaria spp.

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