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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    CVB Veevoedertabel 2016 : chemische samenstellingen en nutritionele waarden van voedermiddelen
    Blok, M.C. ; Spek, J.W. - \ 2016
    Netherlands : CVB - 629
    voedertabellen - voer - chemische samenstelling - voedingswaarde - diervoedering - diervoeding - feed composition tables - feeds - chemical composition - nutritive value - animal feeding - animal nutrition
    IAG ring test feed composition 2016
    Raamsdonk, L.W.D. van; Rhee, N. van de; Pinckaers, V.G.Z. ; Vliege, J.J.M. - \ 2016
    Wageningen : RIKILT Wageningen UR (RIKILT report 2016.014) - 23
    food analysis - feed composition tables - feed safety - ring test - voedselanalyse - voedertabellen - voederveiligheid - ringtest
    The analysis of composition in terms of ingredients is important for detecting economic fraud and for monitoring feed safety. Composition analysis and label control of feed is regulated in Regulation (EC) 767/2009. In a broader view, composition analysis in the entire food chain can improve the effect of monitoring actions. The new legislation on food labelling (Regulation (EC) 1169/2011), effective from December 13th 2014, obliges to provide more detailed information to customers on composition and related topics. A ring test was organized for the microscopic determination of botanic composition in animal feed in the framework of the annual ring tests of the IAG - International Association for Feeding stuff Analysis, Section Feeding stuff Microscopy. The organizer of the ring test was RIKILT - Wageningen UR, The Netherlands. The aim of the ring study was to provide the participants information on the performance of the local implementation of the method for composition analysis of feed. The sample was based on an artificially produced feed mimicking a ruminant feed, and distributed without label information. The participants were requested to produce a correct declaration of the ingredients of the sample. The results were analysed using the IAG model for uncertainty limits. Shares of ingredients in the feed formulation outside the limits of the model were indicated as underor over-estimations. A total of 25 sets of results was returned. The percentage of under- or over-estimations was 28.6% for the seven main ingredients. In the overview of results, the two declared wheat ingredients and the two declared corn products were pooled to one ingredient each. This was necessary since some participants declared a general ingredient (“wheat” and “corn”) and others a specific type (gluten or bran). The use of the original declarations would result in an extra number of non-matching estimations without precise justification. The share of the citrus pulp, in the presence of an equal amount of beet pulp, was underestimated or not detected in 44% of the results. Citrus pulp as such is recognisable as feed ingredient. Still almost three quarter of all estimations appeared to be correct in the ranges of the uncertainty model. This means that visual inspection of the composition of a sample can be used for label control and this method can support traceability of ingredients in case of an incidence. The current results indicate that specific formulations can influence the precision of the estimation of the composition of the feed. The current lack of a complementary system for (chemical) proximate analysis could be a drawback for the overall approach of supporting traceability, necessary for fighting food fraud and for supporting feed safety. Besides a proper method description and up-to-date descriptions of ingredients, well developed skills of technicians are vital for a good performance.
    Benutting van najaarsgras
    Eekeren, N.J.M. van; Govaerts, W. ; Wit, J. de - \ 2009
    BioKennis bericht Geiten 5 (2009). - 4
    biologische landbouw - geitenhouderij - diervoeding - klaverkuilvoer - melkveehouderij - voederwaardering - voedertabellen - grasbrokken - geiten - grasklaver - organic farming - goat keeping - animal nutrition - clover silage - dairy farming - feed evaluation - feed composition tables - grass pellets - goats - grass-clover swards
    Door weersomstandigheden is najaargras vaak moeilijk in te kuilen. Aan de andere kant bevat najaarsgras, door het hoger klaveraandeel, juist het eiwit wat de geiten in het rantsoen hard nodig hebben. Darm Verteerbaar Eiwit (DVE) is vaak een knelpunt op melkproducerende biologische bedrijven. Door gras kunstmatig te laten drogen kan het eiwit in grasklaver als DVE benut worden. In dit Biokennisbericht schetsen onderzoekers van het Louis Bolk Instituut de verschillende afwegingen om najaarsgras in te kuilen of kunstmatig te laten drogen en eventueel in brok te laten persen
    Oplopend percentage kool-/raapzaadschilfers in 100% biologisch legvoer kan niet zonder meer
    Reuvekamp, B.F.J. ; Fiks-van Niekerk, T.G.C.M. - \ 2008
    [Lelystad] : Wageningen UR, Animal Sciences Group - 6
    biologische landbouw - pluimveevoeding - pluimveehouderij - voedertabellen - koolzaad - raapzaad - eikwaliteit - smaak - organic farming - poultry feeding - poultry farming - feed composition tables - rape - rapeseed - egg quality - taste
    Recentelijk komen er meer kool-/raapzaadschilfers op de markt. Door genetische aanpassing zouden veel merken leghennen nu ongevoelig zijn voor de nadelige smaakeffecten van kool-/raapzaad op de eieren. Hierdoor zou er meer van deze grondstof in het voer kunnen worden opgenomen. Uit onze proef blijkt echter dat enige voorzichtigheid op zijn plaats is
    100% biologisch legvoer zonder exotische grondstoffen leidt tot lagere voederwaarde
    Reuvekamp, B.F.J. ; Fiks-van Niekerk, T.G.C.M. - \ 2008
    [Lelystad] : Animal Sciences Group - 5
    biologische landbouw - pluimveehouderij - pluimveevoeding - voedertabellen - organic farming - poultry farming - poultry feeding - feed composition tables
    Een 100% biologisch legvoer zonder exotische (regionale) grondstoffen met een lagere voederwaarde geeft minder goede resultaten dan een 100% biologisch voer met exotische grondstoffen en een gebruikelijke voederwaarde.
    Veel energierijke grondstoffen zijn geschikt voor 100% biologisch leghennenvoer
    Reuvekamp, B.F.J. ; Fiks-van Niekerk, T.G.C.M. - \ 2008
    [Lelystad] : Wageningen UR, Animal Sciences Group - 5
    biologische landbouw - pluimveehouderij - pluimveevoeding - biologische productie - voedertabellen - regionale voedselketens - organic farming - poultry farming - poultry feeding - biological production - feed composition tables - regional food chains
    De vraag is welke regionaal te telen, energierijke grondstoffen kunnen worden opgenomen in een 100% biologisch leghennenvoer. Eigenlijk bleken alle beproefde grondstoffen zonder problemen toepasbaar. Wel zal nog onderzoek in de praktijk moeten volgen.
    Soja en sesam zijn te vervangen door regionale eiwitrijke grondstoffen in 100% biologisch leghennenvoer
    Reuvekamp, B.F.J. ; Fiks-van Niekerk, T.G.C.M. - \ 2008
    [Lelystad] : Wageningen UR, Animal Sciences Group - 5
    biologische landbouw - pluimveehouderij - pluimveevoeding - eiwitgehalte - voedertabellen - biologische productie - regionale voedselketens - organic farming - poultry farming - poultry feeding - protein content - feed composition tables - biological production - regional food chains
    Om geen energie te verspillen aan onnodig transport zijn grondstoffen uit verre landen niet gewenst in een 100% biologisch voer. Veldbonen, erwten en lupinen kunnen sesam en deels soja zonder veel problemen vervangen.
    Comparison of three different diets for organic broilers: effects on performance and body condition
    Rodenburg, T.B. ; Harn, J. van; Krimpen, M.M. van; Ruis, M.A.W. ; Vermeij, I. ; Spoolder, H.A.M. - \ 2008
    British Poultry Science 49 (2008)1. - ISSN 0007-1668 - p. 74 - 80.
    biologische landbouw - dierhouderij - vleeskuikens - pluimveehouderij - diervoeding - biologische productie - voedertabellen - organic farming - animal husbandry - broilers - poultry farming - animal nutrition - biological production - feed composition tables - outdoor areas - methionine - chickens - quality - feed
    . The aim of this study was to assess the feasibility of 100% organic feed for organic broilers by comparing it with 80% organic feed (situation at the time of the experiment; 2004) and 95% organic feed (alternative). 2. Diets were optimised for nutritional value, allowing a maximum 10% increase in feed price when using 100% organic feedstuffs. This could only be achieved at the expense of the methionine content. 3. The birds were reared from 0 to 3 weeks of age in a broiler house in three groups of 500 broilers each on either an 80, a 95 or a 100% organic starter diet. At 3 weeks of age, they were transferred to 15 pens with an outdoor run. Each treatment group of 500 birds was divided into 5 groups of 95 and given an 80, a 95 or a 100% organic finisher diet. 4. Broilers receiving 100% organic feed reached a lower body weight and grew more slowly than those receiving 95% organic feed, mainly because of a lower feed intake. 5. Broilers on 95 or 100% organic feed had a higher incidence of breast blisters than broilers receiving 80% organic feed. 6. The cost price for meat from broilers that received 80% organic feed was ¿1·83 per kg live weight. The cost prices for broilers that received 95 and 100% organic feed were ¿1·84 (+0·8%) and ¿1·93 (+5·4%) per kg live weight, respectively. 7. In conclusion, 95% organic feed led to a better performance than 100% organic feed in this study. Probably, the lower methionine content in the 100% organic feed negatively affected performance. The results for 95% organic feed were similar to 80% organic feed, except for a higher incidence of breast blisters.
    Berekening samenstellingen van mengvoeders: lineaire versus niet-lineaire of stochastische methodiek
    Roush, W.B. ; Zhang, Z. ; Home, P.L.M. van; Meijerhof, R. - \ 1997
    Beekbergen : Praktijkonderzoek Pluimveehouderij (PP uitgave : praktijkonderzoek pluimveehouderij 67) - 23
    mengvoer - voersamenstelling - voedertabellen - berekening - lineaire modellen - stochastische modellen - compound feeds - feed formulation - feed composition tables - calculation - linear models - stochastic models
    Voor het samenstellen van mengvoer wordt over het algemeen gebruik gemaakt van lineaire programmering. Naast lineaire programmering is recentelijk de stochastische of niet-lineaire programmering beschikbaar gekomen.
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