Self-Regulation of Supplemental Feed Intake by Grazing Dairy Cows and its Effect on Animal Performance
作者:
FergusL. Mould,
期刊:
Acta Agriculturae Scandinavica, Section A — Animal Science
(Taylor Available online 1993)
卷期:
Volume 43,
issue 2
页码: 96-100
ISSN:0906-4702
年代: 1993
DOI:10.1080/09064709309410150
出版商: Taylor & Francis Group
关键词: ryegrass;silage intake;milk production;pasture intake;grazing activity
数据来源: Taylor
摘要:
Grazing Norwegian Red dairy cows were offered one of two roughage supplements ‘baled silage (S) or ryegrass (R)’ on anad libitumbasis for a limited period daily. A third group received concentrate (C). Milk and FCM yields were significantly (P<0.05) influenced by treatment (23.65 and 22.81, 23.20 and 22.05 and 22.58 and 22.73 kg d−1, for S, C and R, respectively). Milk composition was unaltered. The cattle offered ryegrass consumed significantly (P<0.05) more supplementary feed and less pasture, and spent less time grazing and more time ruminating than the other two groups. Cattle with high initial yields, despite higher intakes of both pasture and supplement, had reduced liveweight gains and a faster decline in milk production in comparison with low yielders.
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