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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Record number 343533
Title Ranking of in vitro fermentability of 20 feedstuffs with an automated gas production technique. Resuls of a ring test
Author(s) Gelder, A.H. van; Hetta, M.; Rodrigues, M.A.M.; Boever, J.L. de; Hartigh, H. Den; Rymer, C.; Oostrum, M. van; Kaathoven, R. van; Cone, J.W.
Source Animal Feed Science and Technology 123-124 (2005)pt. 1. - ISSN 0377-8401 - p. 243 - 253.
Department(s) ID - Voeding
Publication type Refereed Article in a scientific journal
Publication year 2005
Keyword(s) ruminant feeds - fermentation kinetics - production profiles - fluid
Abstract A ring test was completed to determine within laboratory repeatability, and reproducibility among laboratories, of a gas production technique for measuring fermentation kinetics of feeds in rumen fluid. Eight laboratories in different European countries received 20 feed samples. All used the same gas production equipment and method. Gas production profiles were fitted to a multiphasic model and the most important parameters were statistically compared. Although the within laboratory repeatability of, and levels of, calculated parameters differed among laboratories, in most cases there was a high correlation between pairs of laboratories (r = 0.93¿1.00), although in some cases the correlation was only moderate (r = 0.73¿0.87). Within laboratory gas production profiles were influenced by variation in microbiological activity of the rumen fluid and air pressure changes at the end of the run. Among laboratory differences were observed in calibration factors, type of donor animal and diets fed. Variation sources can be minimized using within run standards.
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