SHORT COMMUNICATION
Crude protein degradability, fibre and tannin levels
of browse forages in an extensive farming system
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1
Department of Animal Science, University of Namibia, Private Bag 13301, Namibia
2
Department of Animal Science and Production, Sokoine University of Agriculture,
P.O. Box 3004, Morogoro, Tanzania
Publication date: 2004-08-30
Corresponding author
G. T. Kamupingene
Department of Animal Science, University of Namibia, Private Bag 13301, Namibia
J. Anim. Feed Sci. 2004;13(Suppl. 1):111-114
KEYWORDS
ABSTRACT
Nutrient concentrations and ruminal degradability of the crude protein (CP) of selected browse forages
consumed by goats in east–central Namibia were studied. All forages varied significantly (P<0.05) in
the parameters studied. Crude protein (mean 17.9 ± 0.64% DM) ranged from 11.6 to 26.2% in Terminalia
sericea and Acacia reficiens leaves, respectively. Total condensed tannins (TCTs) were low and ranged
between 0.39 and 4.21% DM. Neutral detergent fibre (NDF), with a mean value of 41.5±0.84% DM,
was lowest (30.9%) and highest (58.3%) in the parasitic plant Tapinanthus oleifolius growing on Acacia
mellifera and Lonchocarpus nelsii leaves, respectively. The same forages had, similarly, the lowest
(22.5% DM) and highest (38.7% DM) acid detergent fibre (ADF) values.
Acacia hebeclada leaves had the least (6.31% CP) soluble (a) feed protein (mean 9.11 ± 0.36% CP),
while A. reficiens had the most (13.5% CP) soluble feed protein. The potentially degradable fraction (b)
of the feed protein ranged between 72.1 and 83.6% CP. Leaves from A. hebeclada had the highest rumen
undegradable protein (rUDP) content (mean 6.75 ± 0.23% DM) of 9.69%, while those of T. sericea had
the lowest value (4.07%) for the same parameter. Terminalia sericea had also the lowest (7.31% DM)
effective rumen degradable protein (ERDP), which was highest (17.8% DM) in A. reficiens leaves.
Generally, the most preferred forages had high CP, rUDP and ERDP contents and low tannin levels, while
the parasitic plants were low in fibres and, correspondingly, high in total digestible nutrients (TDN). It
was concluded that the browse forages in the study area have low tannin levels and the necessary quality
to promote goat productivity even under in-door feeding conditions.
CITATIONS (3):
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The Ecology of Browsing and Grazing
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2.
Significance of Plant Nutrients and Secondary Metabolites to the Livestock Feeding Selectivity
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Journal of African Studies
3.
Towards Sustainable Food Production in Africa
Johnfisher Mupangwa, Emmanuel Lutaaya, Maria Shipandeni, Absalom Kahumba, Vonai Charamba, Katrina Shiningavamwe