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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    Cracking the cashew nut : Strategies to identify novel allergens
    Bastiaan-Net, Shanna - \ 2020
    Wageningen University. Promotor(en): H.J. Wichers; H.F.J. Savelkoul, co-promotor(en): J.J. Mes; N.W. de Jong. - Wageningen : Wageningen University - ISBN 9789463955218 - 192
    Towards understanding the role of heat-induced structural changes on immunoreactivity and digestibility of cow’s milk protein
    Zenker, Hannah E. - \ 2020
    Wageningen University. Promotor(en): H.J. Wichers; K.A. Hettinga, co-promotor(en): N.W. de Jong; M. Teodorowicz. - Wageningen : Wageningen University - ISBN 9789463955225 - 196
    Online Aardappeldemodag succesvol verlopen, maar hopelijk in 2022 "weer op het veld"
    Haan, Janjo de; Tramper, Marcel ; Ampt-de Jong, Marieke ; Mol-van de Erve, Leanne - \ 2020
    Comparative assessment of general behaviour and fear-related responses in hatchery-hatched and on-farm hatched broiler chickens
    Giersberg, Mona F. ; Poolen, Ilse ; Baere, Kris de; Gunnink, Henk ; Hattum, Theo van; Riel, Johan W. van; Jong, Ingrid C. de - \ 2020
    Applied Animal Behaviour Science 232 (2020). - ISSN 0168-1591
    Behaviour - Broilers - Early feeding - Fear - On-farm hatching - Welfare

    Traditionally, broiler chickens hatch in the hatchery and they are usually not provided with feed and water until placement at the farm. This can have negative effects on their health and welfare. Therefore, alternative systems providing early nutrition, for instance by hatching eggs in a poultry house (on-farm hatching) are increasingly being used in practice. However, information on the behaviour and welfare of on-farm hatched chickens in relation to hatchery-hatched chickens is very limited. This study aims to gain basic knowledge of the behaviour of on-farm hatched chickens (OH) by comparing them to a control group (C) hatched in the hatchery. In addition, fear-related responses were assessed as indicators of chicken welfare. About 13,800 chickens per treatment group were reared in three consecutive batches in eight floor pens under semi-commercial conditions. Direct behavioural observations and three different fear tests, i.e. a novel environment, a human approach and a novel object test, were carried out between two and 36 days of age. Except for ‘disturbance behaviour’ (i.e. pushing or overrunning another chicken), which was more often performed by the OH chickens (F1,3 = 35.10, P < 0.05), no effect of treatment was found on general behaviour. In contrast, nearly all observed behaviours were affected by the chickens’ age (F4,24 = 4.02–41.81, P < 0.05). In the fear tests, most variables, for instance average latency of chickens touching a human and the number of chickens in the vicinity of a novel object, differed between the treatments (P < 0.05) with OH chickens being more fearful and less active. The present results indicate that the hatching system (hatchery-hatching vs. on-farm hatching) seems to have limited effects on broiler chicken activity and general behaviours. In test situations, however, hatchery-hatched chickens showed more active and less fearful responses compared to on-farm hatched chickens. The underlying causes for these differences in response to more challenging situations remain to be investigated further, as these may be related to a higher intrinsic motivation to search for food or more exposure to humans or objects in the hatchery in C chickens as compared to OH chickens, but also to differences in coping style or development of cognitive abilities between the treatment groups.

    Natura 2000-habitattypen droge bossen in Drenthe : Onderzoek naar de kwaliteit van bodem, vegetatie en stamhout van eik in oude bossen
    Bijlsma, R.J. ; Delft, S.P.J. van; Jong, J.J. de - \ 2020
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 3029) - 109
    De kwaliteit van droge, oude bossen in Drentse Natura 2000-gebieden (habitattypen 9120 Beuken-eikenbossen en 9190 Oude eikenbossen) is onderzocht met nadruk op bodemkenmerken, vegetatie en stamhout van eik. De bossen worden beoordeeld ten aanzien van effecten van natuurlijke verzuring door bodemontwikkeling en kunstmatige verzuring door intensief historisch bosgebruik en atmosferische depositie. Kenmerken van de in zeer oude bossen voorkomende dikke humusprofielen krijgen expliciet aandacht. Voor locaties met gedegradeerde bodems worden herstelmaatregelen voorgesteld in de vorm van experimentele bemesting.
    The use of soil nutrient balances in deriving forest biomass harvesting guidelines specific to region, tree species and soil type in the Netherlands
    Vries, Wim de; Jong, Anjo de; Kros, Johannes ; Spijker, Joop - \ 2020
    Forest Ecology and Management 479 (2020). - ISSN 0378-1127
    Forest - Harvest residues - Harvesting guidelines - Netherlands - Nutrient availability - Nutrient balance - Timber harvesting

    The substitution of biomass for fossil fuels in energy consumption is a measure to decrease the emissions of greenhouse gases and thereby mitigate global warming. During recent years, this has led to an increasing interest to use tree harvest residues as feedstock for bioenergy. An important concern related to the removal of harvesting residues is, however, the potential adverse effects on soil fertility caused by increased nutrient removal, relative to conventional stem-only harvesting. In the Netherlands this is a major concern, since most forests are located on poor sandy soils. To develop forest harvesting guidelines, we applied a mass balance approach comparing nutrient inputs by deposition and weathering with nutrient outputs by harvesting and leaching for various timber harvesting scenarios, including both stem-only harvesting and additional removal of tree tops and branches. A distinction was made in seven major tree species, six soil types (three sandy soils, loam, clay and peat soils) and nine regions, with clear variations in atmospheric deposition of phosphorus (P), calcium (Ca), magnesium (Mg) and potassium (K). For each region-tree-soil combination we calculated the maximum amounts that can be harvested such that the output of the nutrients Ca, Mg, K and P is balanced with the inputs. Results showed that at current harvesting rates, a negative balance of Ca, Mg, K or P is hardly calculated for the richer loamy to clayey soil types, while depletion can occur for the poorer sandy soils, particularly of P and K. Results are used to derive forest biomass harvesting guidelines, taking the uncertainties in the mass balance approach into account. The role of mitigating management approaches is also discussed.

    Wat zijn ze waard, die nieuwe eiwitten?
    Jong, G.A.H. de; Mes, J.J. ; Wichers, H.J. - \ 2020
    Voedingsindustrie : vakblad 27 (2020)6. - ISSN 2213-5758 - p. 46 - 49.
    Eiwitten: we kunnen niet zonder. Maar hoe goed zijn nieuwe eiwitten in staat om onze nutritionele behoefte te dekken, en hoe zit het als ze allerlei bewerkingen hebben ondergaan?
    Eenvoudig, goed weiden : De drie stappen van nieuw Nederlands weiden
    Philipsen, A.P. ; Lenssinck, F.A.J. ; Jong, K. de; Hin, K.J. ; Mekkelholt, Winnie ; Bos, A.J. ; Beer, Mark de; Scheepers, R. - \ 2020
    Stichting Weidegang / Wageningen UR Livestock Research - 13 p.
    Aardappeldemodag Online 2020: Geslaagd kennisevenement voor de hele aardappelsector
    Ampt-de Jong, Marieke ; Mol-van de Erve, Leanne - \ 2020
    Genetic mapping of Fusarium wilt resistance in a wild banana Musa acuminata ssp. malaccensis accession
    Ahmad, Fajarudin ; Martawi, Nani M. ; Poerba, Yuyu S. ; Jong, Hans de; Schouten, Henk ; Kema, Gert H.J. - \ 2020
    Theoretical and Applied Genetics (2020). - ISSN 0040-5752

    Banana is an important fruit and food crop, but is threatened by Fusarium wilt, one of the most devastating soil-borne fungal diseases. Only host resistance facilitates banana cultivation in infested soils around the world, but the genetic basis of Fusarium wilt of banana (FWB) is unknown. We selfed a heterozygous wild banana accession Musa acuminata ssp. malaccensis (Mam, AA, 2n = 22) to generate a mapping population and to investigate the inheritance of resistance to Race 1 and tropical race 4 (TR4) that cause FWB. Phenotyping (N = 217) revealed segregation for resistance, and genotyping by sequencing resulted in 2802 high-quality single-nucleotide polymorphic markers (SNPs) that were used for genetic mapping. Combined analyses of these data showed that a single dominant resistance locus controls resistance to Race 1 and maps near the distal part of chromosome 10. Recombinants, together with the position of the putative resistance gene, were further analysed using graphical genotyping, which retrieved markers flanking a 360 kb genetic region that associates with Race 1 resistance. The region contains 165 putative genes on the reference genome, including 19 leucine-rich repeat receptor-like kinase-like genes. At the same position and phase, we also identified a QTL for TR4 resistance, showing that the locus for resistance against Race 1 provided partial resistance to TR4. However, this effect was far less significant and hence not included in the mapping. These data support the breeding of new banana varieties with resistance to Fusarium wilt.

    Vaccins tegen RS-virus voor jonge kinderen en kalfjes
    Klaassen-de Jong, M.C. - \ 2020
    Wageningen : Wageningen University & Research
    Door het RS-virus belanden jaarlijks tweeduizend jonge kinderen in Nederland in het ziekenhuis met een luchtweginfectie. Dit virus is wereldwijd – na malaria – de grootste doodsoorzaak van baby’s. Een genetisch nauw verwant rundervirus geeft een zeer vergelijkbaar ziektebeeld bij kalfjes. Wageningse onderzoekers hebben een infectiemodel opgezet dat helpt bij de ontwikkeling van veilige, effectieve vaccins voor kinderen én kalfjes.
    INNOVA Ezine7 – Challenges and solutions for urban water supply in a changing climate and world
    Martín, Adrià Rubio ; Sempere, Ferran Llario ; Jong, F. de; Timmermans, W. - \ 2020
    Wageningen : Innova project
    Co-designing integrated pest and disease management strategies in eggplant production in Bangladesh
    Nahar, Naznin - \ 2020
    Wageningen University. Promotor(en): P.C. Struik; M. Mahir Uddin, co-promotor(en): T.J. Stomph; P.W. de Jong. - Wageningen : Wageningen University - ISBN 9789463954785 - 164

    Integrated Pest Management (IPM) was developed in response to the crisis caused by unrestricted use of pesticides. The IPM concept matured over time and today, it stands on a  solid conceptual basis and millions of farmers across the globe, especially in developing countries, have been trained in it through the Farmers’ Field School approach. Nevertheless, adoption rate remains frustratingly low. This thesis tries to understand why IPM is so  difficult to implement for smallholder farmers in developing countries and what is needed to make IPM work for them. Eggplant production in Bangladesh was taken as a case and it involved various disease and insect problems. Involving farmers in the research, this study aimed to craft IPM options for farmers that could function in their context, that maximally use natural enemies and that significantly reduce pesticide use. It also assessed the possible reasons for IPM research failures and possible factors contributing to the success or failure of the crafted IPM.

    Farmers participated through interviews, group discussions and field experimentation in tailoring IPM. Negotiations and discussions with these farmers were used to get a better grip on the underlying complexity of all tested IPM options that might hamper adoption. Moreover, a few in vitro and screen house studies were carried out to identify the source of infection of the diseases and to disentangle relative roles of selected IPM components in reducing infections. For each of the disease and insect problems, farmers’ conventional practice of spraying proved ineffective. In contrast, a combination of IPM options proved technically sound and economically viable. However, bottlenecks to scale out these IPM options still remain. For damping-off (caused by several pathogens), soil application of Trichoderma harzianum (T. harzianum) in the nursery combined with seed treatment with hot water was effective, producing 25-64 percentage points more healthy seedlings than farmers’ conventional practice of spraying. This combined treatment also improved seedling quality traits. Laboratory and screen house studies confirmed soil as the major source of pathogen and T. harzianum as major player in both reducing damping-off and enhancing seedling growth. Seedlings raised either by improved practice or farmer’s practice were also transplanted either with or without soil application of T. harzianum in the production field. Transplanting seedlings from improved practice alone reduced wilt and fruit rot, increased marketable yield and farmers’ income compared with their conventional practice of spraying. An additional effect was found when T. harzianum was applied to the field soil. T. harzianum persisted in the improved management fields at the end of the growing season and reduced wilt and rot pathogens. For the management of the eggplant shoot and fruit borer moth (ESFB), pheromone trapping alone or combined with trap-catch-based biorational insecticide spraying reduced fruit infestation, increased yield and income at costs comparable to farmers’ conventional practice. These two IPM options did not affect predatory ladybird beetles and parasitoids Trichogramma spp. and Bracon spp. Farmers’ proposed conventional insecticide spraying with pheromone trapping did not provide further control beyond the trapping alone, rather it affected natural enemies. Farmers’ practice did not reduce infestation but reduced populations of natural enemies.  Therefore,  installing  trap only or adding biorational insecticide spraying with trapping both can be recommended to farmers. However, farmers lacked knowledge of ESFB biology; they need such knowledge to understand the trapping mechanism and its efficacy. As  trapping was tested in  a network of nearby fields of these smallholder farmers, there was a shared concern from researcher and farmers whether the use of mass trapping as an individual farmer with a small plot would be effective; traps might attract male  moths from surroundings outweighing the local depletion.  Indeed trapping in a single field (4 trap) was found ineffective as it showed comparable fruit infestation with farmers’ practice field. In contrast, when traps were installed in an array of 4 × 6: 24 traps (combination of 3-4 adjacent fields) and  in networks of nearby fields (3-5  fields at  a distance of 10-25 m), infestation was substantially reduced compared with farmers’ standard  practice. Per trap, catch of a 4-trap field was three times higher than in 24-trap and network fields; however, infestation in 4-trap field was higher than in 24-trap or network fields, indicating moths were attracted in a 4-trap field from surrounding untrapped fields. For effective trapping, concerted action is needed either by neighbours with directly adjacent fields allowing an array of 4 × 6 traps or by farmers of nearby fields.

    For each of the participatory studies, farmers desired some chemical treatment with IPM options. Although farmers dropped the chemical treatment after a year of study, still it is questionable whether they will continue with purely IPM options because these farmers are  used to spray. Therefore it is better to include spraying with biorationals. Farmers rejected labour-intensive practices. IPM options, generated from this thesis, proved technically and economically viable, but there were some bottlenecks: unavailability of T. harzianum, seed treating machine and pheromone lures, a mismatch between farmers’ knowledge and use of pheromone trapping, and the need for social organisation for trapping to be effective. To alleviate these obstacles, extension and institutional support are required.

    Peptide release after simulated infant in vitro digestion of dry heated cow’s milk protein and transport of potentially immunoreactive peptides across the caco-2 cell monolayer
    Zenker, Hannah E. ; Wichers, Harry J. ; Tomassen, Monic M.M. ; Boeren, Sjef ; Jong, Nicolette W. De; Hettinga, Kasper A. - \ 2020
    Nutrients 12 (2020)8. - ISSN 2072-6643 - 24 p.
    Allergenicity - Caco-2 cell - Cow’s milk protein - Glycation - Immunogenicity - Peptides

    Dry heating of cow’s milk protein, as applied in the production of “baked milk”, facilitates the resolution of cow’s milk allergy symptoms upon digestion. The heating and glycation-induced changes of the protein structure can affect both digestibility and immunoreactivity. The immunological consequences may be due to changes in the peptide profile of the digested dry heated milk protein. Therefore, cow’s milk protein powder was heated at low temperature (60 °C) and high temperature (130 °C) and applied to simulated infant in vitro digestion. Digestion-derived peptides after 10 min and 60 min in the intestinal phase were measured using LC-MS/MS. Moreover, digests after 10 min intestinal digestion were applied to a Caco-2 cell monolayer. T-cell epitopes were analysed using prediction software, while specific immunoglobin E (sIgE) binding epitopes were identified based on the existing literature. The largest number of sIgE binding epitopes was found in unheated samples, while T-cell epitopes were equally represented in all samples. Transport of glycated peptide indicated a preference for glucosyl lysine and lactosyl-lysine-modified peptides, while transport of peptides containing epitope structures was limited. This showed that the release of immunoreactive peptides can be affected by the applied heating conditions; however, availability of peptides containing epitopes might be limited.

    Effects of on-farm and traditional hatching on welfare, health, and performance of broiler chickens
    Jong, Ingrid C. de; Hattum, Theo van; Riel, Johan W. van; Baere, Kris De; Kempen, Ine ; Cardinaels, Sofie ; Gunnink, Henk - \ 2020
    Poultry Science 99 (2020)10. - ISSN 0032-5791 - p. 4662 - 4671.
    broiler - health - on-farm hatching - production - welfare

    In on-farm hatching systems, eggs that have been incubated for 18 D are transported to the broiler farm. After hatching around day 21, the chicks have immediate access to feed and water. By contrast, traditionally hatched chicks are in early life exposed to dust and pathogens in the hatcher, handling procedures, and transport and remain without feed and water until they have arrived on the farm 1 to 3 D after hatching. We compared welfare and performance of on-farm hatched (OH) and traditionally hatched control (C) Ross 308 broiler chickens from day 0 to 40, housed under semicommercial conditions. The experiment included 3 production cycles in 4 rooms, with each room containing 1 OH and 1 C pen with 1,150 chickens in each pen. Per cycle, C and OH chicks were from the same batch of eggs of 1 parent stock flock. Day-old chick quality was worse for OH than C chickens (hock and navel score; P < 0.05). On-farm hatched chickens were heavier than C chickens until day 21 of age (P < 0.05). Total mortality was significantly lower in OH compared with C pens (P < 0.05). A tendency for lower footpad dermatitis scores was found in OH pens compared with C pens (P < 0.10), probably because of the dryer litter in OH than C pens (P < 0.05). No differences between treatments were found in gait, hock burn, cleanliness, and injury scores, and no or only minor, short lasting differences were found in pathology and intestinal histology. In conclusion, the present study showed that on-farm hatching may be beneficial for broiler welfare, as it reduced total mortality and resulted in dryer litter which is known to be beneficial for reducing footpad dermatitis.

    Long-term effects of folic acid and vitamin-B12 supplementation on fracture risk and cardiovascular disease : Extended follow-up of the B-PROOF trial
    Oliai Araghi, Sadaf ; Kiefte-de Jong, Jessica C. ; Dijk, Suzanne C. van; Swart, Karin M.A. ; Ploegmakers, Kim J. ; Zillikens, M.C. ; Schoor, Natasja M. van; Groot, Lisette C.P.G.M. de; Lips, Paul ; Stricker, Bruno H. ; Uitterlinden, André G. ; Velde, Nathalie van der - \ 2020
    Clinical Nutrition (2020). - ISSN 0261-5614
    B-vitamins - Cardiovascular disease - Fracture - Long-term follow-up

    Background & aims: In the initial B-proof, we found inconsistent results of B vitamin supplementation. However, the debate regarding the effects of B vitamins on age-related diseases continues. Therefore, our aim was to investigate the long-term effects (5–7 years follow-up) of an intervention with folic acid and vitamin-B12 supplementation on fracture and cardiovascular disease risk. Methods: Extended follow-up of the B-PROOF trial, a multi-center, double-blind randomized placebo-controlled trial designed to assess the effect of 2–3 years daily supplementation with folic acid (400 μg) and vitamin-B12 (500 μg) versus placebo (n = 2,919). Primary outcome was verified self-reported fracture incidence and secondary outcomes were self-reported cardiovascular endpoints, which were collected through a follow-up questionnaires Proportional hazard analyses was used for the effect of the intervention on risk of fracture(s) and logistic regression for the effect of the intervention on risk of cardiovascular disease. Results: A total of 1,298 individuals (44.5%) participated in the second follow-up round with median of 54 months [51–58], (n = 662 and n = 636, treatment versus placebo group). Median age at baseline was 71.0 years [68.0–76.0] for both groups. No effect was observed of the intervention on osteoporotic fracture or any fracture risk after a follow-up (HR: 0.99, 95% CI: 0.62–1.59 and HR: 0.77; 95% CI: 0.50–1.19, respectively), nor on cardiovascular or cerebrovascular disease risk (OR: 1.05; 95%CI: 0.80–1.44 and OR: 0.85; 95%CI: 0.50–1.45, respectively). Potential interaction by baseline homocysteine concentration was observed for osteoporotic- and any fracture (p = 0.10 and 0.06 respectively), which indicated a significantly lower risk of any fracture in the treatment group with higher total homocysteine concentrations (>15.1 μmol/l). No age-dependent effects were present. Conclusions: This study supports and extends previous null-findings of the B-PROOF trial and shows that supplementation of folic acid and vitamin-B12 has no effect on fracture risk, nor on cardiovascular disease in older individuals over a longer follow-up period. However, B-vitamin supplementation may be beneficial in reducing fractures in individuals with high total homocysteine concentrations, a finding which needs to be replicated.

    Online aardappeldemodag
    Brouwer, Thie Arend ; Ampt-de Jong, Marieke ; Mol-van de Erve, Leanne ; Tramper, Marcel - \ 2020
    Pilot ten behoeve van substraatvoorkeur voor stofbadgedrag van leghennen
    Rommers, Jorine ; Jong, Ingrid de; Weeghel, Ellen van - \ 2020
    Wageningen : Wageningen Livestock Research (Rapport / Wageningen Livestock Research 1264) - 36
    dierenwelzijn - dierlijke productie - hennen - pluimvee - diergedrag - huisvesting, dieren - animal welfare - animal production - hens - poultry - animal behaviour - animal housing
    In a simple and short-lasting pilot study it was determined whether laying hens prefer to dustbath in either small coconut fibres, grinded wheat straw, sawdust (fine) or peat moss. Peat moss has been included because it is a preferred dustbathing substrate for laying hens. The study was performed in two units on a commercial laying hen farm. In each unit, all four substrates were tested. Video recordings were made during the afternoon and analysed during four days. This pilot study indicated that an equal number of hens showed dustbathing in peat moss and coconut fibres, whereas grinded wheat straw and sawdust were hardly used for dustbathing.
    Aardappeldemodag vanachter de laptop
    Ampt-de Jong, Marieke ; Mol-van de Erve, Leanne - \ 2020
    Aromatic Potential of Diverse Non-Conventional Yeast Species for Winemaking and Brewing
    Gamero, Amparo ; Dijkstra, Annereinou ; Smit, Bart ; Jong, Catrienus de - \ 2020
    Fermentation 6 (2020)2. - ISSN 2311-5637
    Traditionally, Saccharomyces species are those used to conduct industrial alcoholic fermentations. Recently, an increasing interest has arisen with respect to the potential of so-called non-conventional yeasts to improve wine and beer aroma profiles, keeping the particular terroir of each region or for the development of craft beers. In this study, the potential of diverse non-conventional yeasts to improve aroma in winemaking and brewing was investigated, testing several pure and mixed culture combinations. In addition, a comparison between microscale and labscale was carried out in order to assess the value of microwine and microbeer as screening tools. The results indicated that non-Saccharomyces yeasts were good candidates to enhance or diversify aroma profiles in alcoholic beverages, especially regarding acetate ester yield and fruity aromas. However, mixed cultures with Saccharomyces spp. are normally required to achieve a successful fermentation. The adjustment of pithing ratios is crucial for this purpose. Microscale is presented as an effective and efficient screening tool to compare different culture combinations, although scaling-up will always be necessary in order to get results closer to real winemaking or brewing processes
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