Factors affecting the voluntary feed intake of sheep grazingPennisetum clandestinum(kikuyu) pastures: Observations from forage analysis
作者:
J.P. Henaar,
N.M. Tainton,
J.B.J. van Ryssen,
期刊:
African Journal of Range & Forage Science
(Taylor Available online 1993)
卷期:
Volume 10,
issue 3
页码: 140-144
ISSN:1022-0119
年代: 1993
DOI:10.1080/10220119.1993.9638341
出版商: Taylor & Francis Group
关键词: Nitrate;nitrogen;oxalate;saponin
数据来源: Taylor
摘要:
Sheep were used in two investigations to study factors which could limit voluntary intake ofPennisetum clandestinum(kikuyu) pasture. Possible reasons for the low intakes were found in the high soluble nitrogen and nitrate content of the pasture, its high oxalate content, and its considerable potential for foaming, the latter suggesting the presence of sapbnins. The high fibre content of the material could also have limited intake in wilted, dry or stemmy kikuyu. The relative importance of these factors appears to change with growth stage, the amount of nitrogen fertilizer applied, stocking rate and moisture supply. The factors which are detrimental to forage quality such as oxalates and nitrates are higher in the young and actively growing material than in older material, while thein vitroproduction of foam seems unrelated to forage quality and remained high, despite changes in other factors which detrimentally affected forage quality.
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