Abstract
Abstract Three systems of rotational grazing, shifting every 2, 4, or 7 days, were compared with ‘ration’ grazing over two winters. The ration-grazed ewes were kept on a run-off and allowed to graze the next paddock for 1/2 h per day in June, 1 h in July, and 2 1/2 h in August. When each paddock had been grazed, it became the run-off while the next paddock was grazed. Pasture residue after grazing in the ration-grazed treatment averaged 220 kg DM/ha compared with a mean of 350 kg DM/ha on the rotation treatments. Winter regrowth over 2 years averaged 10.0 kg DM/ha/day on the ration treatment and 12.8 kg DM/ha/day for the rotation treatments. Wool weights and lamb birth weights were not affected by winter grazing management but in the rotation treatments ewe live-weight gain in winter increased with grazing duration, averaging 5.3 kg, 6.2 kg, and 6.8 kg on the 2, 4, and 7 day shifts respectively. The ration-grazed ewes gained 5.7 kg each winter.
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