Abstract
The perennial ryegrass cultivars 'Grasslands Ruanui', 'Grasslands Ariki' and 'Grasslands Nui' were sown with clover and compared at three levels of irrigation under rotational grazing with sheep. Ryegrass cultivar had little effect on total annual pasture production, although Nui pastures produced more total DM in autumn and winter. Nui was the most persistent cultivar and produced substantially more ryegrass than the orhers (6.1 t/ha, compared with 4.1 t/ha for Ruanui and 3.3 t/ha for Ariki) . Nui pastures produced less white clover, volunteer grasses and weeds. When grazed at the same stocking rate, sheep liveweight gain was similar regardless of ryegrass cultivar.
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