Abstract
Forty-eight beef steers were fed ad libitum on a mixed diet of 55% barley ( Hordeum vulgare) grain, 25% narrow-leafed lupin ( Lupinus angustifolius) grain, 19% milled oat ( Avena sativa) hay and 1% minerals. The experiment compared the effects of leaving all the grain whole (unprocessed) with milling 25% (the lupin fraction), 55% (the barley fraction) or 80% (all the grain) of the diet. Milling the grain did not affect the length of the feeding period or daily dry matter intake. Growth rate was increased by 0.00289 kg liveweight/day and 0.00246 kg carcase weight/day, while conversion ratio was reduced by 0.027 kg dry matter/kg liveweight gain and 0.050 kg dry matter/kg carcase weight gain for each extra percentage unit of grain milled, regardless of whether the extra grain that was milled was barley or lupins.
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