Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Structural features of condensed tannins affect in vitro ruminal methane production and fermentation characteristics
Huyen, N.T. ; Fryganas, C. ; Uittenbogaard, G. ; Mueller-Harvey, I. ; Verstegen, M.W.A. ; Hendriks, W.H. ; Pellikaan, W.F. - \ 2016
The Journal of Agricultural Science 154 (2016)8. - ISSN 0021-8596 - p. 1474 - 1487.

An in vitro study was conducted to investigate the effects of condensed tannin (CT) structural properties, i.e. average polymer size (or mean degree of polymerization), percentage of cis flavan-3-ols and percentage of prodelphinidins in CT extracts on methane (CH4) production and fermentation characteristics. Condensed tannins were extracted from eight plants in order to obtain different CT types: blackcurrant leaves, goat willow leaves, goat willow twigs, pine bark, redcurrant leaves, sainfoin plants, weeping willow catkins and white clover flowers. They were analysed for CT content and CT composition by thiolytic degradation, followed by high performance liquid chromatography (HPLC) analysis. Grass silage was used as a control substrate. Condensed tannins were added to the substrate at a concentration of 40 g/kg, with or without polyethylene glycol (+ or −PEG 6000 treatment) to inactivate tannins, then incubated for 72 h in mixed buffered rumen fluid from three different lactating dairy cows per run. Total cumulative gas production (GP) was measured by an automated GP system. During the incubation, 12 gas samples (10 µl) were collected from each bottle headspace at 0, 2, 4, 6, 8, 12, 24, 30, 36, 48, 56 and 72 h of incubation and analysed for CH4. A modified Michaelis-Menten model was fitted to the CH4 concentration patterns and model estimates were used to calculate total cumulative CH4 production (GPCH4). Total cumulative GP and GPCH4 curves were fitted using biphasic and monophasic modified Michaelis-Menten models, respectively. Addition of PEG increased GP, GPCH4, and CH4 concentration compared with the −PEG treatment. All CT types reduced GPCH4 and CH4 concentration. All CT increased the half time of GP and GPCH4. Moreover, all CT decreased the maximum rate of fermentation for GPCH4 and rate of substrate degradation. The correlation between CT structure and GPCH4 and fermentation characteristics showed that the proportion of prodelphinidins within CT had the largest effect on fermentation characteristics, followed by average polymer size and percentage of cis flavan-3-ols.

Chemical structures of condensed tannins affect in vitro ruminal methane production and fermentation characteristics
Huyen, N.T. ; Fryganas, C. ; Uittenbogaard, G. ; Mueller-Harvey, I. ; Hendriks, W.H. ; Pellikaan, W.F. - \ 2015
In: Proceedings of the WIAS Science Day 2015 - Facing the Future. - WIAS - p. 15 - 15.
Wageningen evaluating programmes for analytical laboratories (WEPAL): organization and purpose.
Houba, V.J.G. ; Uittenbogaard, J. ; Pellen, P. - \ 1996
Communications in Soil Science and Plant Analysis 27 (1996). - ISSN 0010-3624 - p. 421 - 431.
Wageningen evaluating programmes for analytical laboratories (WEPAL) as instruments for continuous quality control for analytical performance.
Houba, V.J.G. ; Uittenbogaard, J. ; Pellen, P. - \ 1995
In: Abstracts Int. Symp. on Soil and Plant Analysis, Wageningen (1995) A18, 21
Chemical composition of various plant species.
Houba, V.J.G. ; Uittenbogaard, J. - \ 1994
Dept. Soil Science and Plant Nutrition, Wageningen Agric. Univ - 226 p.
Chemical composition of various plant species
Houba, V.J.G. ; Uittenbogaard, J. ; Lange-Harmse, A.M. de - \ 1991
Wageningen : Vakgroep Bodemkunde en plantevoeding, Wageningen Agricultural University (International plant - analytical exchange (IPE) ) - 118 p.
Automatic determination of 'total soluble nitrogen' in soil extracts.
Houba, V.J.G. ; Novozamsky, I. ; Uittenbogaard, J. ; Lee, J.J. van der - \ 1987
Landwirtschaftliche Forschung 40 (1987). - p. 295 - 302.
Eine automatische Methode zur Bestimmung von NH4-N und loslichem organischen Stickstoff in Bodenextrakten.
Houba, V.J.G. ; Novozamsky, I. ; Uittenbogaard, J. ; Lee, J.J. van der - \ 1987
In: Ermittlung des Dungenbedarfes mit Hilfe der Elektro-Ultra-Filtration im Vergleich zu anderen Verfahren - p. 119 - 129.
Een onderzoek van het bodemmilieu voor straatbomen
Bakker, J.W. ; Uittenbogaard, M. - \ 1974
Wageningen : I.C.W. (Verspreide overdrukken / Instituut voor Cultuurtechniek en Waterhuishouding 166) - 3
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