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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    Occurence of mycotoxins and pesticides in straw and hay used as animal feed
    Mol, J.G.J. ; Rijk, T.C. de; Egmond, H.J. van; Jong, J. de - \ 2014
    Wageningen : RIKILT Wageningen UR (RIKILT report 2014.006)
    mycotoxinen - pesticiden - stro - hooi - diervoedering - veehouderij - voederveiligheid - dierenwelzijn - mycotoxins - pesticides - straw - hay - animal feeding - livestock farming - feed safety - animal welfare
    The aim of this survey was to provide data on the occurrence of mycotoxins and pesticide residues in straw and hay used as animal feed in the Netherlands.
    Benutting van najaarsgras in de geitenhouderij
    Eekeren, N.J.M. van - \ 2010
    Biokennis
    biologische landbouw - geitenhouderij - herfst - graskuilvoer - hooi - grasbrokken - eiwit - voersamenstelling - organic farming - goat keeping - autumn - grass silage - hay - grass pellets - protein - feed formulation
    Door weersomstandigheden is najaargras vaak moeilijk in te kuilen. Aan de andere kant bevat najaarsgras, door het hogere 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 dossier leest u meer over verschillende afwegingen om najaarsgras in te kuilen of kunstmatig te laten drogen, en eventueel in brok te laten persen.
    A numerical modelling approach for biomass field drying
    Bartzanas, T. ; Bochtis, D.D. ; Sørensen, C.G. ; Sapounas, A. ; Green, O. - \ 2010
    Biosystems Engineering 106 (2010)4. - ISSN 1537-5110 - p. 458 - 469.
    computational fluid-dynamics - air-flow - tunnel greenhouse - weather data - grass - hay - simulation - arrangement - temperature - ventilation
    In grass conservation systems, the field drying process of cut grass is an important function since it determines subsequent losses and possible hazardous effects of during silage. The drying process of harvested grass was evaluated using two different numerical approaches. Firstly, an existing experimentally-verified analytical model was used. Several parameters were improved from previous studies such as the evaluation of stomata conductance from outside climate variables. Secondly, a CFD modelling approach was applied to open field drying process of the biomass. The cut biomass in the field was simulated using the equivalent macro-porous medium approach. Experimental values were used to obtain realistic and accurate boundary conditions. The developed CFD model was validated using the existing analytical model that is based on evaporations as estimated from the Penman equation. An acceptable agreement between simulated and measured values of water content was obtained. The mean difference in the estimated outputs from the two models was 8%. Condensation occurred during the night and was correctly simulated by both types of models. In general, a good correspondence was found between the two approaches. The use of the CFD model reveals the climate heterogeneity in the grass area and also, creates the possibility of applying the model as a decision support model for an enhanced treatment of the grass after cutting
    Effect of qualitative feed restriction on energy metabolism and nitrogen retention in sheep
    Kamalzadeh, A. ; Koops, W.J. - \ 2009
    South African Journal of Animal Science = Suid-Afrikaanse Tydskrif Vir Veekun 39 (2009)1. - ISSN 0375-1589 - p. 30 - 39.
    compensatory growth - body-composition - weight - steers - lambs - efficiency - nutrition - hay
    Periodic restrictions in feed quality and quantity is an important phenomenon in regions where animal production should bridge the gap between periods of forage production separated by a dry season. Eighteen Swifter male lambs, weaned at the age of ca. three months, were used to quantify effects of feed quality restriction and realimentation on changes in energy and nitrogen metabolism. The diet consisted of grass straw (17 MJ of gross energy [GE] and 46 g crude protein [CP] per kg dry matter [DM]) on an ad libitum basis and 35 g/kg(0.75)/d mixed concentrates (16.5 MJ of GE and 173 g CP per kg DM). At the age of ca. 3.5 months the animals were randomly divided into six blocks, based on live weight, according to a randomized complete block design. Within each block, the animals were randomly assigned to two restricted treatments (RI and R2) and an unrestricted control (C) treatment. Treatments R1 and R2 were subjected to feed quality restriction by withholding the concentrate for 3 and 4.5 months, respectively. A modified linear model was developed to study the effects of restriction and realimentation. The comparison between treatments was made by analyzing the data of the RI and R2 animals as deviations from the control animal in each block. During the restriction period, restricted animals lost weight and showed negative energy (EB) and nitrogen balances (NB), whereas their intake of low quality roughage increased significantly. During the realimentation period (5 and 6 months for the RI and R2 animal, respectively), the R1 and R2 animals grew significantly faster than the control animals. The realimented animals persisted in ingesting significantly more low quality roughage and their EB and NB were significantly greater that those of the control animals. The R2 animals needed a longer period of realimentation because of a longer period of restriction. The expression of compensatory growth was mainly related to a sustained higher grass straw (low quality roughage) intake during the realimentation periods, and a significantly greater efficiency of metabolizable energy intake. The maintenance requirement of realimented animals was significantly lower only during the initial stages of realimentation compared with the controls. It seemed as if a three months feed restriction period in weaned sheep was better than 4.5 months
    Evaluation of the extent of associative effects of two groups of four feeds using an in vitro gas production procedure
    Robinson, P.H. ; Getachew, F. ; Cone, J.W. - \ 2009
    Animal Feed Science and Technology 150 (2009)1-2. - ISSN 0377-8401 - p. 9 - 17.
    amino-acid digestibility - neutral detergent fiber - white-pekin ducks - metabolizable energy - rumen fermentation - mixed feeds - diets - hay - barley - corn
    A ration formulated for ruminants is often a mixture of individual feeds, and its energetic value is generally calculated by summing the energy value of the individual feeds in it, on the assumption that the energy value of individual feeds will be the same when they are fed in combination with other feeds. In vitro gas production techniques were used to determine whether associative effects of feeds occur. Two sets of four feeds from California (alfalfa hay, AH; barley grain, BG; corn silage, CS1, soybean meal, SM) and four feeds from The Netherlands (grass silage, GS; corn silage, CS2; citrus pulp, CiP; corn gluten meal, CG) were incubated alone, and in various combinations, in buffered rumen fluid using in vitro gas techniques. Gas production (ml/g DM) at 2, 4, 6, 8, 10, 24, 30, 48 and 72 h of incubation was measured from all feed combinations. The percent increase in gas production measured on combinations of feeds, versus the gas calculated to have been produced based upon incubation of the individual feeds, was used to determine the extent of the associative effects. One-way associative effects (i.e., substitution of CS1 or CS2 by AH, BG or SM) generally occurred (P
    Microbial enrichment of torrefied grass fibers : a novel ingredient of potting soil
    Trifonova, R.D. - \ 2008
    University of Groningen. Promotor(en): J.D. van Elsas, co-promotor(en): Joeke Postma. - [S.l.] : S.n. - ISBN 9789036736695 - 146
    groeimedia - vezels - hooi - grassen - microbiële flora - verrijking - verbeteraars - fytotoxiciteit - growing media - fibres - hay - grasses - microbial flora - enrichment - amendments - phytotoxicity
    Onderzoek naar de mogelijke besmetting van een partij hooi met haren van de eikenprocessierups
    Spijker, J.H. ; Aelst, A.C. van; Niemeijer, C.M. - \ 2007
    Wageningen : Alterra (Alterra-rapport 1606) - 25
    hooi - voer - paardenvoeding - paarden - besmetting - insecten - thaumetopoea processionea - tortricidae - insectenplagen - bomen - voederveiligheid - hay - feeds - horse feeding - horses - contamination - insects - thaumetopoea processionea - tortricidae - insect pests - trees - feed safety
    Mogelijk effect van dierziekte bij paarden als gevolg van het voorkomen van restatnten van de eikenprocessierups in diervoeder, namelijk hooi
    Physico-chemical characteristics and degradation rate of soluble protein obtained from the washout fraction of feeds
    Gierus, M. ; Jonge, L.H. de; Meijer, G.A.L. - \ 2005
    Livestock Production Science 97 (2005)2-3. - ISSN 0301-6226 - p. 219 - 229.
    ruminal degradation - dairy-cows - in-situ - grass-silage - rumen - degradability - hay - digestibility - supplements - system
    The (water)-soluble fraction of feeds is often assumed to be completely and immediately degraded in the rumen. The objective of this study was to separate the washout fraction (fraction A) obtained usually by difference after submitting the nylon bags to the machine-washing program, to investigate the nature and the degradation of the soluble crude protein in the washout fraction. The washout fraction obtained in vitro (filtrate) of 10 feeds was collected in water using nylon mesh as a filter. The feeds used in the study were: two grass silages, soybean meal, three corn gluten feeds, lupine meal, rapeseed meal, wet brewers grain silage and corn gluten feed silage. Average N losses during filtration and from machine-washed nylon bags ranged from 15% (rape seed meal) to 74% (grass silage) and were not different between procedures. N recovered in the filtrate ranged from 12% (soybean meal) to 60% (corn gluten feed silage) of sample N. The three fractions obtained from the filtrate were: soluble protein (TP), non-protein N (NPN) and fine particles (NS). The NS fraction was obtained after centrifugation of the filtrate and comprised 0% to 87% of N in the filtrate. Soluble protein (TP) in the supernatant was obtained after precipitation with trichloroacetic acid and N in the remaining supernatant was defined as non-protein N (NPN). Significant amounts of TP were found in soybean meal (58%), lupine meal (30%) and rapeseed meal (27%) as percent of total N in the filtrate. NPN ranged from 13% to 100% of N in the filtrate. The in vitro incubation of the protein N (NS + TP) showed that all fractions were not completely degraded, suggesting a potential participation as escape protein. Fine particles in the filtrate have similar degradation rates as the residue left in the filter. It is concluded that the washout fraction consisted of different crude protein fractions that were not always completely and immediately degraded in the rumen.
    Kuilplastic voor meerjarig gebruik
    Corporaal, J. ; Breij, A.P.J. ; Dieren, J. van; Withaar, R. - \ 1995
    Praktijkonderzoek / Praktijkonderzoek Rundvee, Schapen en Paarden (PR), Waiboerhoeve 8 (1995)2. - ISSN 0921-8874 - p. 13 - 15.
    conservering - milieu - hooi - kunststoffen - kwaliteit - recycling - rubber - kuilvoer - kuilvoerbereiding - silo's - opslagloodsen - technologie - afvalverwerking - afval - synthetische materialen - conservation - environment - hay - plastics - quality - recycling - rubber - silage - silage making - silos - stores - technology - waste treatment - wastes - synthetic materials
    In 1992 werden op de Waiboerhoeve twee soorten 0,50 mm dikke kuilfolie in gebruik genomen voor meerjarig gebruik.
    Een vergelijking tussen voordrooggrassilage en grashooi als ruwvoer voor meerling dragende ooien = A comparison between grass-silage and grass-hay as a roughage for ewes pregnant of a large litter
    Sebek, L.B.J. ; Everts, H. - \ 1993
    Lelystad : IVVO-DLO (Rapport / IVVO-DLO no. 246) - 30
    voer - vrouwelijke dieren - hooi - voedingswaarde - kuilvoer - feeds - female animals - hay - nutritive value - silage
    Efficient field treatment for silage and hay
    Bosma, A.H. - \ 1991
    Wageningen : IMAG (Nota / Instituut voor Mechanisatie, Arbeid en Gebouwen P-91-8) - 24
    hooi - plantaardige producten - ruwvoer (roughage) - behandeling - voedergrassen - hay - plant products - roughage - treatment - fodder grasses
    Ontsluiting van stro, hooi, ook met een loog of zwakzuur
    Anonymous, - \ 1981
    Wageningen : Pudoc (Literatuurlijst / Centrum voor Landbouwpublikaties en Landbouwdocumentatie no. 4536)
    bibliografieën - koolhydraten - celmembranen - celwanden - cellulose - voer - hooi - rijststro - stro - bibliographies - carbohydrates - cell membranes - cell walls - feeds - hay - rice straw - straw
    Werkmethoden bij het verzamelen van stro- en hooipakken
    Koning, K. de; Edens, F.J. ; Leeuwerke, H.B. - \ 1978
    Wageningen : IMAG (Publikatie / Instituut voor mechanisatie, arbeid en gebouwen no.111) - 48
    balenpers - oogsten - hooi - laders - nederland - opraappersen - plantaardige producten - persen - stapels - behandeling - voedergrassen - balers - harvesting - hay - loaders - netherlands - pickup balers - plant products - presses - stacks - treatment - fodder grasses
    Diverse aspecten van hakselen van voorgedroogd gras
    Hengeveld, A.G. - \ 1977
    Lelystad : Proefstation voor de Rundveehouderij (Rapport / Proefstation voor de Rundveehouderij 51) - 22
    hooi - rundvee - plantaardige producten - behandeling - nederland - voedergrassen - hay - cattle - plant products - treatment - netherlands - fodder grasses
    Chemische toevoegingen (conserveringsmiddelen) bij de hooiwinning
    Anonymous, - \ 1976
    Wageningen : [s.n.] (Literatuurlijst / Centrum voor landbouwpublikaties en documentatie no. 3872)
    bibliografieën - oogsten - hooi - plantaardige producten - behandeling - voedergrassen - bibliographies - harvesting - hay - plant products - treatment - fodder grasses
    Invloed van veldperiode en snelheid van nadrogen op de opname van hooi: verslag van onderzoek in de periode 1971 t/m 1973 op proefboerderij Heino
    Hengeveld, A.G. - \ 1976
    Lelystad : Proefstation voor de Rundveehouderij (Rapport / Proefstation voor de Rundveehouderij 42) - 21
    plantaardige producten - behandeling - rundvee - hooi - voer - samenstelling - voedergrassen - plant products - treatment - cattle - hay - feeds - composition - fodder grasses
    Orientatiestudie Nederlands graslandonderzoek
    Meys, J.A.C. - \ 1975
    Hoorn : [s.n.] (Intern rapport / Instituut voor veevoedingsonderzoek Hoorn no. 82) - 52
    dierlijke productie - rundvee - begrazing - hooi - nederland - voedergrassen - animal production - cattle - grazing - hay - netherlands - fodder grasses
    De voederopname van ventilatiehooi - afkomstig van al dan niet thermisch behandeld gras - door melkvee : 1971/'72
    Reeuwijk, L. van - \ 1974
    Wageningen : [s.n.] (Mededelingen / Instituut voor bewaring en verwerking van landbouwproducten no. 432) - 16
    rundvee - voer - hooi - voedingswaarde - cattle - feeds - hay - nutritive value
    Statistische gegevens met betrekking tot de produktie van hooi en silage in Nederland = Statistical information relating to hay and silage production in the Netherlands
    Anonymous, - \ 1974
    Wageningen : [s.n.] (Literatuurlijst / Centrum voor landbouwpublikaties en landbouwdocumentatie no. 3663)
    bibliografieën - economische situatie - groenvoeders - hooi - nederland - kuilvoer - statistiek - economische productie - bibliographies - economic situation - green fodders - hay - netherlands - silage - statistics - economic production
    Gemechaniseerd schuurdrogen van hooi
    Wijk, A. van - \ 1974
    Wageningen : [s.n.] (Publikatie / Instituut voor landbouwtechniek en rationalisatie no. 182) - 39
    drogen - hooi - drogers - voedergrassen - drying - hay - driers - fodder grasses
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