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Silage and milk production a comparison between unwilted and wilted grass silages



Silage and milk production a comparison between unwilted and wilted grass silages



Grass and Forage Science 39(2): 187-194



Three grass silages made in sunny weather in early July from 2nd-harvest perennial ryegrass were compared in a 16-wk feeding experiment with 12 Ayrshire cows. The silages were either unwilted or wilted with and without conditioning, and had mean dry matter (DM) concentrations of 201, 261 and 272 g kg-1, and in vitro DOMD concentrations of 650, 669 and 672 g kg-1 DM, respectively. All the silages had formic acid (Add-F) applied at a rate of 2.6 l t[tonne]-1 and were offered ad lib plus 6 kg concentrates per cow per day. The daily intakes of silage DM were 9.05 kg per cow on the unwilted treatment and 9.86 and 9.65 kg on the wilted treatments with and without conditioning, respectively. Daily milk yields were 17.1, 17.6 and 17.4 kg per cow on the unwilted, and wilted with and without conditioning treatments, respectively, and were not significantly different. Fat concentrations in the milk were not affected significantly by treatment; the crude protein and solids-not-fat concentrations were significantly higher on the wilted than on the unwilted treatment. The efficiency of utilization of metabolizable energy for lactation was 6-7% lower with the wilted than with the unwilted silages; thus the unwilted silage was superior to the wilted silages as a feed for dairy cows.

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Accession: 006415466

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DOI: 10.1111/j.1365-2494.1984.tb01680.x


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