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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Chemical composition and in vitro fermentation of tannin-rich tree fruits
Animal Feed Science and Technology, Volume 140, No. 3-4, Year 2008
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Description
Dry and mature tree fruits are a potential source of protein for goats in the semi-arid areas of southern Africa, but their chemical composition and feeding value is largely unknown. This study presents the chemical composition and in vitro fermentation of indehiscent whole fruits and separated seed and hull fractions from Acacia nilotica, Acacia erubescens, Acacia sieberiana, Acacia erioloba, Piliostigma thonningii and Dichrostachys cinerea trees. Results indicate that the N contents of whole fruits ranged between 13.5 g/kg DM (A. nilotica) and 27.1 g/kg DM (A. erubescens). Seeds had a higher N content than hulls for all tree species. A. nilotica, D. cinerea and P. thonningii fruits had high levels of extractable phenolics (758, 458 and 299 g/kg DM, respectively). Soluble phenolics (SPh) and ytterbium precipitable phenolics (YbPh) levels were negatively correlated to in vitro gas production but positively correlated to in vitro organic matter degradability (iOMD). Partition factors for whole fruits at 48 h ranged between 3.6 mg/ml for A. erioloba and 7.8 mg/ml for A. nilotica. Seeds of A. erioloba, A. erubescens and P. thonningii were consistently fermented more efficiently throughout the incubation period compared to their whole fruits or hulls. Estimating in vitro degradability of phenolic-rich substrates through filtration procedures can give erroneous results due to the loss of soluble phenolics, which are not necessarily degradable. The feeding value of fruits from D. cinerea and A. nilotica tree species may be reduced due to the presence of high levels of phenolics. © 2007 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Mlambo, Victor
Swaziland, Mbabane
University of Eswatini
Mould, Fergus Lawrence
United Kingdom, Reading
University of Reading
Sikosana, Joseph L.N.
Zimbabwe, Bulawayo
Matopos Research Station Bulawayo
Smith, Timothy
United Kingdom, Reading
University of Reading
Owen, Emyr
United Kingdom, Reading
University of Reading
Mueller-Harvey, Irene
United Kingdom, Reading
University of Reading
Statistics
Citations: 49
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1016/j.anifeedsci.2007.03.001
ISSN:
03778401