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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Tits lay eggs earlier in warm spring
Verhagen, Irene - \ 2019
The mechanisms underlying seasonal timing of breeding : a multi-level approach using bi-directional genomic selection on timing of egg-laying
Verhagen, Irene Charlotte - \ 2019
Wageningen University. Promotor(en): M.E. Visser, co-promotor(en): V.N. Laine. - Wageningen : Wageningen University - ISBN 9789463950398 - 221
Veldrobot mist regie en samenwerking
Booij, Johan ; Kamp, Jan ; Veldhuisen, Bram - \ 2019
Zelflerende spuit is niet volledig autodidactisch
Veldhuisen, Bram ; Booij, Johan ; Hoekzema, Gerard - \ 2019
Gewasverzorging spil voor jonge akkerbouwer
Veldhuisen, Bram - \ 2019
Use of organic inputs by arable farmers in six agro-ecological zones across Europe : Drivers and barriers
Hijbeek, R. ; Pronk, A.A. ; Ittersum, M.K. van; Verhagen, A. ; Ruysschaert, G. ; Bijttebier, J. ; Zavattaro, L. ; Bechini, L. ; Schlatter, N. ; Berge, H.F.M. ten - \ 2019
Agriculture, Ecosystems and Environment 275 (2019). - ISSN 0167-8809 - p. 42 - 53.
Barriers - Compost - Drivers - Europe - Manure - Straw

Soil organic matter (SOM) in agricultural soils builds up via – among others - the use of organic inputs such as straw, compost, farmyard manure or the cultivation of green manures or cover crops. SOM has benefits for long-term soil fertility and can provide ecosystem services. Farmer behaviour is however known to be motivated by a larger number of factors. Using the theory of planned behaviour, we aimed to disentangle these factors. We addressed the following research question: What are currently the main drivers and barriers for arable farmers in Europe to use organic inputs? Our study focuses on six agro-ecological zones in four European countries (Austria, Flanders [Belgium], Italy and the Netherlands) and four practices (straw incorporation, green manure or cover crops, compost and farmyard manure). In a first step, relevant factors were identified for each practice with farmers using 5 to ten semi-structured interviews per agro-ecological zone. In a second step, the relevance of these factors was quantified and they were classified as either drivers or barriers in a large scale farm survey with 1263 farmers. In the semi-structured interviews, 110 factors that influenced farmer decisions to use an organic input were identified. In the larger farm survey, 60% of the factors included were evaluated as drivers, while 40% were evaluated as barriers for the use of organic inputs. Major drivers to use organic inputs were related to the perceived effects on soil quality (such as improved soil structure or reduced erosion) and the positive influence from social referents (such as fellow farmers or agricultural advisors). Major barriers to use organic inputs were financial (increased costs or foregone income) and perceived effects on crop protection (such as increased weeds, pests and diseases, or increased pesticide use). Our study shows that motivating farmers to use organic inputs requires specific guidance on how to adapt cultivation practices to reduce weeds, pests and diseases for specific soil types, weather conditions, and crops. In addition, more research is needed on the long-term financial consequences of using organic inputs.

Surplus vitamin B12 use does not reduce fatigue in patients with Irritable Bowel Syndrome or inflammatory bowel disease : A randomized double-blind placebo-controlled trial
Scholten, Anne-Marie ; Vermeulen, Esther ; Dhonukshe-Rutten, Rosalie A.M. ; Verhagen, Teuni ; Visscher, Angeline ; Olivier, Anouk ; Timmer, Lilian ; Witteman, Ben J.M. - \ 2018
Clinical Nutrition ESPEN 23 (2018). - ISSN 2405-4577 - p. 48 - 53.
Fatigue - IBD - IBS - Vitamin B supplementation

Objective: In non-conventional care, high doses of vitamin B12 supplementation are used for the treatment of fatigue even in case of normal vitamin B12 blood levels. We performed a randomized placebo controlled trial to investigate the effect of surplus oral vitamin B12 supplementation on fatigue in patients with IBS or IBD. Methods: This randomized double-blind, placebo-controlled trial included 95 out-clinic IBS and IBD patients with deactivating fatigue and normal vitamin B12 blood levels (≥150 pmol/l) aged 18–65 years. Participants were randomly assigned to receive 1000 μg vitamin B12 daily or a placebo supplement for 8 weeks. The primary outcome measure was fatigue (Checklist Individual Strength (CIS)). In addition, measures of quality of life and depression were examined. Results: No significant difference in scores of the CIS subscale ‘subjective fatigue’ was observed between the intervention group and the control group with changes in scores of −8.1 ± 9.5 and −8.3 ± 10.6 (95% CI −11.65 to 6.71), respectively. The scores on the CIS subscale ‘motivation’ improved with a significant change in scores of −2.2 ± 4.6 (95% CI −4.4 to −0.04). No significantly increased scores were observed for depression or quality of life in the intervention group compared to the control group. Conclusion: This study did not confirm the expected effect of non-conventional surplus vit B12 supplementation on fatigue in IBS or IBD patients. In addition, no positive effect was observed on depression or quality of life. We conclude that surplus treatment with vitamin B12 in IBS and IBD patients suffering from fatigue has no beneficial clinical effect.

Operationalizing the WEF nexus: quantifying the trade-offs and synergies between the water, energy and food sectors : Dutch Climate Solutions research programme
Altamirano, M.A. ; Bodegom, A.J. van; Linden, Nico van der; Rijke, Hugo de; Verhagen, A. ; Bucx, Tom ; Boccalon, Agnese ; Zwaan, Bob van der - \ 2018
ECN (ECN E--18-036) - 121 p.
The purpose of this research is to develop an analytical and modelling approach that allows for the quantification of trade-offs between the water, energy and food nexus at different scales; allowing to go from national analysis of nexus stress by identifying and quantifying key intersectoral claims and trade-offs, up to a more detailed and even local specific analysis of the trade-offs. These trade-offs and the system understanding created by following the proposed steps for the analysis of nexus stress, inform them the design of Climate Smart Solutions and Strategies that make use of the most powerful leverage points and introduce or exploit existing synergies between the water-energy-food sectors. The national and local scales analyses following the proposed methodology have been applied to Ethiopia. At the national scale the integration has been done by making use of system analysis techniques in combination with the use of diverse modelling techniques for the quantification of the key trade-offs identified. The soft-linking Deltares Water Allocation Model (Ribasim) and TIAM-ECN model for optimization of Energy Systems allowed for the quantification of trade-offs between the water and the energy sectors given the national plans to make significant increase in hydropower dams. This modelling exercise was complemented with excel calculations to quantify the trade-off between biomass production for energy and land available for food production, as well as to quantify the complex linkages between water and food security.
Report on the Nexus Humera case study in Ethiopia : Dutch Climate Solutions research programme
Bodegom, A.J. van; Gebremedhin, Eskedar ; Linden, Nico van der; Rozemeijer, N.G. ; Verhagen, A. - \ 2018
ECN (ECN E--18-020) - 67 p.
Farmers’ adaptive strategies in agricultural commercialization and food and nutrition security in Myanmar
Gabrielli, Monica ; Herens, M.C. ; Peters, Bram ; Bosch, D.R.B. ; Maden, E.C.L.J. van der; Linderhof, Vincent ; Verhagen, A. - \ 2018
Farmers’ adaptive strategies in agricultural commercialization and food and nutrition security in Myanmar
Gabrielli, Monica ; Herens, M.C. ; Peters, Bram ; Bosch, D.R.B. ; Maden, E.C.L.J. van der; Linderhof, Vincent ; Verhagen, A. - \ 2018
The challenge of food systems research : What difference does it make?
Ruben, Ruerd ; Verhagen, Jan ; Plaisier, Christine - \ 2018
Sustainability 11 (2018)1. - ISSN 2071-1050
3I Approach - Feedbacks & interlinkages - Food policy - Food systems - Interdisciplinary research

Recent discussions on the results of food security programs devote key attention to complex interactions between policy interventions and business innovation for improving nutrition outcomes. This shift from linear approaches of food and nutrition security towards a more interlinked and nested analysis of food systems dynamics has profound implications for the design and organization of research and innovation processes. In this article we outline our experience with interdisciplinary and interactive processes of food systems analysis at different scale levels, paying systematic attention to three critical system interfaces: intersections with other systems, interactions within the food system, and incentives for food system innovations (the so-called: 3I approach). We discuss the importance of these interfaces for leveraging food system adaptation and managing food system transformation. We also provide illustrative examples of the relevance of food systems analysis for the identification of appropriate and effective programs for reinforcing the resilience, responsiveness and inclusiveness of novel food and nutrition programs.

Commercially viable agriculture and consumption of nutritious foods: a framework for identifying development pathways : A desk review
Herens, M.C. ; Peters, Bram ; Brouwers, J.H.A.M. ; Bosch, D.R.B. ; Maden, E.C.L.J. van der; Linderhof, Vincent ; Verhagen, A. - \ 2018
Wageningen : Wageningen Centre for Development Innovation (Report WCDI 18-039) - 53 p.
Food systems in low and middle income countries are changing rapidly in response to economic and market developments, environmental impacts, and dietary changes. Within this context, informed policy and sustainable development processes are needed to shape climate-smart and resilient food systems for food and nutrition security at farming household level. This research project aimed to a) explore the complexity of the contextual dynamics in which smallholder farming households operate; and b) contribute to a better conceptual understanding of commercial food production strategies in relation to consumption choices. A literature review was conducted, exploring both scientific and grey literature, in parallel to consultation rounds with a multidisciplinary team of agronomists, economists, nutritionists and international development specialists to explore existing insights, align available expertise, and find common ground on how to create a useful framework that would fit the specific interests and expertise of each of the actors involved. Key elements for our framework were preliminary drawn from existing frameworks. A number of - non-exclusive - pathways were identified. These include subsistence-oriented production for the household’s own consumption (source of food), whereby women – as producers as well as care takers - are seen as the crucial agents for household food security and health outcomes; production for sale in markets (source of income); and agricultural policies (national and global), affecting a range of supply and demand factors that establish the price of marketed food and non-food crops (food price policies). The important characteristics for the framework for viable commercial agriculture and consumption of nutritious foods evolve around different aggregation levels: the individual (gender and power dynamics), the household (household food production, income generation, food purchase choices, care practices, access to health care), the community (employment opportunity, collaboration, microfinance, care and social (infra)structure), and the regional/nation (price and trade policy) level.
Klimaatslimme melkveehouderij : een routekaart voor implementatie van mitigatie- en adaptatiemaatregelen
Vries, Marion de; Hoving, Idse ; Middelkoop, Jantine van; Napel, Jan ten; Weide, Rommie van der; Verhagen, Jan ; Vellinga, Theun - \ 2018
Wageningen : Wageningen Livestock Research (Wageningen Livestock Research rapport 1131) - 90
The aim of this study was to describe the challenges faced by the Dutch dairy sector in terms of climate change mitigation and adaptation, and to show possible pathways for implementation of mitigation and adaptation options towards 2030 and 2050. With regard to mitigation, the dairy sector has to comply with targets for mitigation of greenhouse gas emissions in sectoral, national and European legislation. With regard to adaptation, dairy farms are expected to benefit from increasing temperatures and CO2 concentrations, but this may be counteracted by increases in extreme weather events and animal and plant diseases and plagues. A roadmap is shown with phased implementation of mitigation- and adaptation options, based on their effectiveness, costs, readiness for practical implementation, and interaction with other aspects of sustainability.
Validation of biomarkers of food intake-critical assessment of candidate biomarkers
Dragsted, Lars O. ; Gao, Qinfeng ; Scalbert, Augustin ; Vergères, Guy ; Kolehmainen, Marjukka ; Manach, Claudine ; Brennan, Lorraine ; Afman, L.A. ; Wishart, David S. ; Lacueva, Cristina Andres ; Garcia-Aloy, Mar ; Verhagen, H. ; Feskens, E.J.M. ; Praticò, Giulia - \ 2018
Genes & Nutrition 13 (2018). - ISSN 1555-8932
Biomarkers of food intake (BFIs) are a promising tool for limiting misclassification in nutrition research where more subjective dietary assessment instruments are used. They may also be used to assess compliance to dietary guidelines or to a dietary intervention. Biomarkers therefore hold promise for direct and objective measurement of food intake. However, the number of comprehensively validated biomarkers of food intake is limited to just a few. Many new candidate biomarkers emerge from metabolic profiling studies and from advances in food chemistry. Furthermore, candidate food intake biomarkers may also be identified based on extensive literature reviews such as described in the guidelines for Biomarker of Food Intake Reviews (BFIRev). To systematically and critically assess the validity of candidate biomarkers of food intake, it is necessary to outline and streamline an optimal and reproducible validation process. A consensus-based procedure was used to provide and evaluate a set of the most important criteria for systematic validation of BFIs. As a result, a validation procedure was developed including eight criteria, plausibility, dose-response, time-response, robustness, reliability, stability, analytical performance, and inter-laboratory reproducibility. The validation has a dual purpose: (1) to estimate the current level of validation of candidate biomarkers of food intake based on an objective and systematic approach and (2) to pinpoint which additional studies are needed to provide full validation of each candidate biomarker of food intake. This position paper on biomarker of food intake validation outlines the second step of the BFIRev procedure but may also be used as such for validation of new candidate biomarkers identified, e.g., in food metabolomic studies.
Artificial light at night shifts daily activity patterns but not the internal clock in the great tit (Parus major)
Spoelstra, Kamiel ; Verhagen, Irene ; Meijer, Davy ; Visser, Marcel E. - \ 2018
Proceedings of the Royal Society. B: Biological Sciences 285 (2018)1875. - ISSN 0962-8452
Artificial light at night - Circadian period - Circadian phase - Entrainment - Light pollution
Artificial light at night has shown a dramatic increase over the last decades and continues to increase. Light at night can have strong effects on the behaviour and physiology of species, which includes changes in the daily timing of activity; a clear example is the advance in dawn song onset in songbirds by low levels of light at night. Although such effects are often referred to as changes in circadian timing, i.e. changes to the internal clock, two alternative mechanisms are possible. First, light at night can change the timing of clock controlled activity, without any change to the clock itself; e.g. by a change in the phase relation between the circadian clock and expression of activity. Second, changes in daily activity can be a direct response to light (‘masking’), without any involvement of the circadian system. Here, we studied whether the advance in onset of activity by dim light at night in great tits (Parus major) is indeed attributable to a phase shift of the internal clock.We entrained birds to a normal light/dark (LD) cycle with bright light during daytime and darkness at night, and to a comparable (LDim) schedule with dim light at night. The dim light at night strongly advanced the onset of activity of the birds. After at least six days in LD or LDim,we kept birds in constant darkness (DD) by leaving off all lights so birds would revert to their endogenous, circadian system controlled timing of activity.We found that the timing of onset in DD was not dependent on whether the birds were kept at LD or LDim before the measurement. Thus, the advance of activity under light at night is caused by a direct effect of light rather than a phase shift of the internal clock. This demonstrates that birds are capable of changing their daily activity to low levels of light at night directly, without the need to alter their internal clock.
What drives farmers to increase soil organic matter? Insights from the Netherlands
Hijbeek, R. ; Pronk, A.A. ; Ittersum, M.K. van; Berge, H.F.M. ten; Bijttebier, J. ; Verhagen, A. - \ 2018
Soil Use and Management 34 (2018)1. - ISSN 0266-0032 - p. 85 - 100.
farmers’ behaviour - farmers’ intentions - organic materials - soil conservation - soil management - soil organic matter - theory of planned behaviour

Soil organic matter (SOM) is an important resource base for arable farming. For policies on SOM to be effective, insight is needed on why and under which conditions farmers are willing to increase SOM content. This study used the theory of planned behaviour to analyse what prevents or encourages Dutch farmers to increase the SOM content of their fields. In an online survey, 435 arable farmers were asked questions to understand their attitude (perceived benefits), subjective norm (social pressure) and perceived behavioural control (anticipated impediments and obstacles) related to management of SOM. Farmers’ answers were related to their intention to increase SOM content, use of organic materials and perceived increase in SOM content. Our results showed that Dutch farmers are well aware of the possible benefits of SOM content for crop productivity. Farmers’ attitude, subjective norm and perceived decrease in SOM content were significantly related to their intention to increase SOM content. In our farm survey, this intention was very strong: 90% of the farmers stated a high or very high intention to increase the SOM content of their fields. A higher intention to increase SOM content was correlated with the use of organic materials as expressed as total and effective C (P = 0.003 and P = 0.002, respectively), but this did not lead to a perceived increase in SOM content. From a farmer's point of view, this indicates that increasing SOM content is to a large degree beyond their direct influence. The Dutch Manure and Fertiliser Act, costs of organic inputs and the need to cultivate profitable crops (such as potatoes or sugar beet) were indicated as important impeding factors for increasing SOM content.

Open teelten en klimaatadaptatie in relatie tot de financiële weerbaarheid
Verhagen, Jan ; Asseldonk, Marcel van; Pronk, Annette - \ 2018
Wageningen : Wageningen University & Research, Wageningen Plant Research, Business unit Agrosystem (Wageningen Plant Research rapport WPR-755) - 33
Guidelines for Biomarker of Food Intake Reviews (BFIRev) : How to conduct an extensive literature search for biomarker of food intake discovery
Praticò, Giulia ; Gao, Qian ; Scalbert, Augustin ; Vergères, Guy ; Kolehmainen, Marjukka ; Manach, Claudine ; Brennan, Lorraine ; Pedapati, Sri Harsha ; Afman, Lydia A. ; Wishart, David S. ; Vázquez-Fresno, Rosa ; Lacueva, Cristina Andres ; Garcia-Aloy, Mar ; Verhagen, Hans ; Feskens, Edith J.M. ; Dragsted, Lars O. - \ 2018
Genes & Nutrition 13 (2018)1. - ISSN 1555-8932
Biomarkers - Food exposure markers - Literature search methodology - Metabolomics - Systematic review
Identification of new biomarkers of food and nutrient intake has developed fast over the past two decades and could potentially provide important new tools for compliance monitoring and dietary intake assessment in nutrition and health science. In recent years, metabolomics has played an important role in identifying a large number of putative biomarkers of food intake (BFIs). However, the large body of scientific literature on potential BFIs outside the metabolomics area should also be taken into account. In particular, we believe that extensive literature reviews should be conducted and that the quality of all suggested biomarkers should be systematically evaluated. In order to cover the literature on BFIs in the most appropriate and consistent manner, there is a need for appropriate guidelines on this topic. These guidelines should build upon guidelines in related areas of science while targeting the special needs of biomarker methodology. This document provides a guideline for conducting an extensive literature search on BFIs, which will provide the basis to systematically validate BFIs. This procedure will help to prioritize future work on the identification of new potential biomarkers and on validating these as well as other biomarker candidates, thereby providing better tools for future studies in nutrition and health.
Serologic evidence of West Nile virus and Usutu virus infections in Eurasian coots in the Netherlands
Lim, S.M. ; Geervliet, M. ; Verhagen, J.H. ; Müskens, G.J.D.M. ; Majoor, F.A. ; Osterhaus, Albert D.M.E. ; Martina, Byron E. - \ 2018
Zoonoses and Public Health 65 (2018)1. - ISSN 1863-1959 - p. 96 - 102.
Reservoir hosts - Surveillance - Usutu virus - Vector-borne diseases - West Nile virus - Wild birds

West Nile virus (WNV) and Usutu virus (USUV) are arboviruses that are maintained in enzootic transmission cycles between mosquitoes and birds and are occasionally transmitted to mammals. As arboviruses are currently expanding their geographic range and emerging in often unpredictable locations, surveillance is considered an important element of preparedness. To determine whether sera collected from resident and migratory birds in the Netherlands as part of avian influenza surveillance would also represent an effective source for proactive arbovirus surveillance, a random selection of such sera was screened for WNV antibodies using a commercial ELISA. In addition, sera of jackdaws and carrion crows captured for previous experimental infection studies were added to the selection. Of the 265 screened serum samples, 27 were found to be WNV-antibody-positive, and subsequent cross-neutralization experiments using WNV and USUV confirmed that five serum samples were positive for only WNV-neutralizing antibodies and seven for only USUV. The positive birds consisted of four Eurasian coots (Fulica atra) and one carrion crow (Corvus corone) for WNV, of which the latter may suggest local presence of the virus, and only Eurasian coots for USUV. As a result, the screening of a small selection of serum samples originally collected for avian influenza surveillance demonstrated a seroprevalence of 1.6% for WNV and 2.8% for USUV, suggesting that this sustained infrastructure could serve as a useful source for future surveillance of arboviruses such as WNV and USUV in the Netherlands.

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