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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Fungal artillery of zombie flies: infectious spore dispersal using a soft water cannon
Ruiter, Jolet de; Arnbjerg-Nielsen, Sif Fink ; Herren, Pascal ; Høier, Freja ; Fine Licht, Henrik H. De; Jensen, Kaare H. - \ 2019
Journal of the Royal Society, Interface 16 (2019)159. - ISSN 1742-5689 - 10 p.
biomimetic soft cannon - dispersal range - Entomophthora muscae - force-balance model - fungal spore ejection - high-speed videography

Dead sporulating female fly cadavers infected by the house fly-pathogenic fungus Entomophthora muscae are attractive to healthy male flies, which by their physical inspection may mechanically trigger spore release and by their movement create whirlwind airflows that covers them in infectious conidia. The fungal artillery of E. muscae protrudes outward from the fly cadaver, and consists of a plethora of micrometric stalks that each uses a liquid-based turgor pressure build-up to eject a jet of protoplasm and the initially attached spore. The biophysical processes that regulate the release and range of spores, however, are unknown. To study the physics of ejection, we design a biomimetic 'soft cannon' that consists of a millimetric elastomeric barrel filled with fluid and plugged with a projectile. We precisely control the maximum pressure leading up to the ejection, and study the cannon efficiency as a function of its geometry and wall elasticity. In particular, we predict that ejection velocity decreases with spore size. The calculated flight trajectories under aerodynamic drag predict that the minimum spore size required to traverse a quiescent layer of a few millimetres around the fly cadaver is approximately 10 µm. This corroborates with the natural size of E. muscae conidia (approx. 27 µm) being large enough to traverse the boundary layer but small enough (less than 40 µm) to be lifted by air currents. Based on this understanding, we show how the fungal spores are able to reach a new host.

Genotype by environment interactions in poultry breeding programs
Thinh Tuan, Chu - \ 2019
Wageningen University. Promotor(en): E. Norberg; H. Komen, co-promotor(en): J. Jensen; P. Berg; J.W.M. Bastiaansen. - Wageningen : Wageningen University - ISBN 9788793787803 - 199
Use of genomic information to exploit genotype-by-environment interactions for body weight of broiler chicken in bio-secure and production environments
Chu, Thinh T. ; Bastiaansen, John W.M. ; Berg, Peer ; Romé, Hélène ; Marois, Danye ; Henshall, John ; Jensen, Just - \ 2019
Genetics, Selection, Evolution 51 (2019)1. - ISSN 0999-193X

Background: The increase in accuracy of prediction by using genomic information has been well-documented. However, benefits of the use of genomic information and methodology for genetic evaluations are missing when genotype-by-environment interactions (G × E) exist between bio-secure breeding (B) environments and commercial production (C) environments. In this study, we explored (1) G × E interactions for broiler body weight (BW) at weeks 5 and 6, and (2) the benefits of using genomic information for prediction of BW traits when selection candidates were raised and tested in a B environment and close relatives were tested in a C environment. Methods: A pedigree-based best linear unbiased prediction (BLUP) multivariate model was used to estimate variance components and predict breeding values (EBV) of BW traits at weeks 5 and 6 measured in B and C environments. A single-step genomic BLUP (ssGBLUP) model that combined pedigree and genomic information was used to predict EBV. Cross-validations were based on correlation, mean difference and regression slope statistics for EBV that were estimated from full and reduced datasets. These statistics are indicators of population accuracy, bias and dispersion of prediction for EBV of traits measured in B and C environments. Validation animals were genotyped and non-genotyped birds in the B environment only. Results: Several indications of G × E interactions due to environmental differences were found for BW traits including significant re-ranking, heterogeneous variances and different heritabilities for BW measured in environments B and C. The genetic correlations between BW traits measured in environments B and C ranged from 0.48 to 0.54. The use of combined pedigree and genomic information increased population accuracy of EBV, and reduced bias of EBV prediction for genotyped birds compared to the use of pedigree information only. A slight increase in accuracy of EBV was also observed for non-genotyped birds, but the bias of EBV prediction increased for non-genotyped birds. Conclusions: The G × E interaction was strong for BW traits of broilers measured in environments B and C. The use of combined pedigree and genomic information increased population accuracy of EBV substantially for genotyped birds in the B environment compared to the use of pedigree information only.

Genetic parameters for body weight and different definitions of residual feed intake in broiler chickens
Mebratie, Wossenie ; Madsen, Per ; Hawken, Rachel ; Romé, Hélène ; Marois, Danye ; Henshall, John ; Bovenhuis, Henk ; Jensen, Just - \ 2019
Genetics, Selection, Evolution 51 (2019)1. - ISSN 0999-193X

Background: The objectives of this study were to (1) simultaneously estimate genetic parameters for BW, feed intake (FI), and body weight gain (Gain) during a FI test in broiler chickens using multi-trait Bayesian analysis; (2) derive phenotypic and genetic residual feed intake (RFI) and estimate genetic parameters of the resulting traits; and (3) compute a Bayesian measure of direct and correlated superiority of a group selected on phenotypic or genetic residual feed intake. A total of 56,649 male and female broiler chickens were measured at one of two ages (t or t- 6 days). BW, FI, and Gain of males and females at the two ages were considered as separate traits, resulting in a 12-trait model. Phenotypic RFI (RFI P(RFI P) and genetic RFI (RFI RFI G) were estimated from a conditional distribution of FI given BW and Gain using partial phenotypic and partial genetic regression coefficients, respectively. Results: Posterior means of heritability for BW, FI and Gain were moderately high and estimates were significantly different between males and females at the same age for all traits. In addition, the genetic correlations between male and female traits at the same age were significantly different from 1, which suggests a sex-by-genotype interaction. Genetic correlations between RFI RFI P and RFIG RFI G were significantly different from 1 at an older age but not at a younger age. Conclusions: The results of the multivariate Bayesian analyses in this study showed that genetic evaluation for production and feed efficiency traits should take sex and age differences into account to increase accuracy of selection and genetic gain. Moreover, for communicating with stakeholders, it is easier to explain results from selection on RFI RFI G than selection on RFI RFI P, since RFI RFI G is genetically independent of production traits and it explains the efficiency of birds in nutrient utilization independently of energy requirements for production and maintenance.

Future directions for the concept of salutogenesis: a position article
Bauer, G.F. ; Roy, M. ; Bakibinga, P. ; Contu, P. ; Downe, S. ; Eriksson, M. ; Espnes, G.A. ; Jensen, B.B. ; Juvinya Canal, D. ; Lindström, B. ; Mana, A. ; Mittelmark, M.B. ; Morgan, A.R. ; Pelikan, J.M. ; Saboga-Nunes, L. ; Sagy, S. ; Shorey, S. ; Vaandrager, L. ; Vinje, H.F. - \ 2019
Health Promotion International (2019). - ISSN 0957-4824
Aaron Antonovsky advanced the concept of salutogenesis almost four decades ago (Antonovsky, Health, Stress and Coping. Jossey-Bass, San Francisco, CA, 1979; Unravelling the Mystery of Health. Jossey-Bass, San Francisco, CA, 1987). Salutogenesis posits that life experiences shape the sense of coherence (SOC) that helps to mobilize resources to cope with stressors and manage tension successfully (determining one’s movement on the health Ease/Dis-ease continuum). Antonovsky considered the three-dimensional SOC (i.e. comprehensibility, manageability, meaningfulness) as the key answer to his question about the origin of health. The field of health promotion has adopted the concept of salutogenesis as reflected in the international Handbook of Salutogenesis (Mittelmark et al., The Handbook of Salutogenesis. Springer, New York, 2016). However, health promotion mostly builds on the more vague, general salutogenic orientation that implies the need to foster resources and capacities to promote health and wellbeing. To strengthen the knowledge base of salutogenesis, the Global Working Group on Salutogenesis (GWG-Sal) of the International Union of Health Promotion and Education produced the Handbook of Salutogenesis. During the creation of the handbook and the regular meetings of the GWG-Sal, the working group identified four key conceptual issues to be advanced: (i) the overall salutogenic model of health; (ii) the SOC concept; (iii) the design of salutogenic interventions and change processes in complex systems; (iv) the application of salutogenesis beyond health sector. For each of these areas, we first highlight Antonovsky’s original contribution and then present suggestions for future development. These ideas will help guide GWG-Sal’s work to strengthen salutogenesis as a theory base for health promotion.
Mutation dynamics of CpG dinucleotides during a recent event of vertebrate diversification
Pértille, Fábio ; Silva, Vinicius H. Da; Johansson, Anna M. ; Lindström, Tom ; Wright, Dominic ; Coutinho, Luiz L. ; Jensen, Per ; Guerrero-Bosagna, Carlos - \ 2019
Epigenetics 14 (2019)7. - ISSN 1559-2294 - p. 685 - 707.
copy number variations - CpG - DNA methylation - Gallus gallus - genetic variation - germ line - single nucleotide polymorphisms

DNA methylation in CpGs dinucleotides is associated with high mutability and disappearance of CpG sites during evolution. Although the high mutability of CpGs is thought to be relevant for vertebrate evolution, very little is known on the role of CpG-related mutations in the genomic diversification of vertebrates. Our study analysed genetic differences in chickens, between Red Junglefowl (RJF; the living closest relative to the ancestor of domesticated chickens) and domesticated breeds, to identify genomic dynamics that have occurred during the process of their domestication, focusing particularly on CpG-related mutations. Single nucleotide polymorphisms (SNPs) and copy number variations (CNVs) between RJF and these domesticated breeds were assessed in a reduced fraction of their genome. Additionally, DNA methylation in the same fraction of the genome was measured in the sperm of RJF individuals to identify possible correlations with the mutations found between RJF and the domesticated breeds. Our study shows that although the vast majority of CpG-related mutations found relate to CNVs, CpGs disproportionally associate to SNPs in comparison to CNVs, where they are indeed substantially under-represented. Moreover, CpGs seem to be hotspots of mutations related to speciation. We suggest that, on the one hand, CpG-related mutations in CNV regions would promote genomic ‘flexibility’ in evolution, i.e., the ability of the genome to expand its functional possibilities; on the other hand, CpG-related mutations in SNPs would relate to genomic ‘specificity’ in evolution, thus, representing mutations that would associate with phenotypic traits relevant for speciation.

Estimating time evolving cross-dependence of porcine reproduction and respiratory syndrome sero-prevalence in Danish swine herds
Lopes Antunes, Ana Carolina ; Jensen, Dan - \ 2019
Preventive Veterinary Medicine 167 (2019). - ISSN 0167-5877 - p. 85 - 89.
PRRS - Sero-prevalence - Temporal linear dependence - Time-series

Porcine reproductive and respiratory syndrome (PRRS) has been a challenge for the Danish swine industry. It is important to identify forms of time-dependence in PRRS sero-prevalence among swine herds at country level, in order to allocate resources in an effective manner. This is of particular value if an increase of PRRS sero-prevalence occurs in a particular type of herds and control measures are taken to avoid disease spread downwards the swine production system. The objective of this study was to describe the presence (or lack thereof) of the linear cross-dependence of PRRS sero-prevalence in Danish swine herds from 2012 to 2014. These temporal dependencies were calculated for Danish swine herds with different biosecurity status and directional trade contacts between them: from nucleus/breeding herds to multipliers and finisher herds and from nucleus/breeding herds to finishers via multiplier herds. We used a method proposed for non-stationary time-series decomposition which allows an assessment of the existence of linear cross-dependencies between multiple of types of herds. The results demonstrate the existence of cyclic patterns of direct linear positive and negative dependence between PRRS sero-prevalence between multipliers and finishers herds. This suggests that the associations between PRRS sero-prevalence time-series follow the swine production system downwards for the majority of the study period, i.e. an increase or decrease in PRRS sero-prevalence in multiplier is followed by a shift in PRRS sero-prevalence in finisher herds after a few weeks. For specific time periods, however, these associations might have been influenced by other factors.

The genetics of body weight and feed efficiency in broiler chickens
Mebratie, Wossenie Shibabaw - \ 2019
Wageningen University. Promotor(en): J. Jensen; H. Bovenhuis. - Wageningen : Wageningen University - ISBN 9788793787391 - 191
Genome wide association study of body weight and feed efficiency traits in a commercial broiler chicken population, a re-visitation
Mebratie, Wossenie ; Reyer, Henry ; Wimmers, Klaus ; Bovenhuis, Henk ; Jensen, Just - \ 2019
Scientific Reports 9 (2019)1. - ISSN 2045-2322

Genome wide association study was conducted using a mixed linear model (MLM) approach that accounted for family structure to identify single nucleotide polymorphisms (SNPs) and candidate genes associated with body weight (BW) and feed efficiency (FE) traits in a broiler chicken population. The results of the MLM approach were compared with the results of a general linear model approach that does not take family structure in to account. In total, 11 quantitative trait loci (QTL) and 21 SNPs, were identified to be significantly associated with BW traits and 5 QTL and 5 SNPs were found associated with FE traits using MLM approach. Besides some overlaps between the results of the two GWAS approaches, there are considerable differences in the detected QTL. Even though the genomic inflation factor (λ) values indicate that there is no strong family structure in this population, using models that account for the existing family structure may reduce bias and increase accuracy of the estimated SNP effects in the association analysis. The SNPs and candidate genes identified in this study provide information on the genetic background of BW and FE traits in broiler chickens and might be used as prior information for genomic selection.

Recovery of nutrients from the liquid fraction of digestate : Use of enriched zeolite and biochar as nitrogen fertilizers
Kocatürk-Schumacher, Nazlı Pelin ; Zwart, Kor ; Bruun, Sander ; Jensen, Lars Stoumann ; Sørensen, Helle ; Brussaard, Lijbert - \ 2019
Journal of Plant Nutrition and Soil Science 182 (2019)2. - ISSN 1436-8730 - p. 187 - 195.
biogas digestate - clinoptilolite - double-pot technique - enriched sorbent - initial loading - slow release N fertilizer

The liquid fraction after liquid/solid separation of biogas digestate has a high potential as a fertilizer due to its high nutrient concentration. However, the direct application of digestate in agricultural fields results in practical problems due to its voluminous nature. One solution to this could be to concentrate nutrients onto sorbents such as biochar or zeolites, which can subsequently be used as a fertilizer. This study investigated the ability of biochar and zeolite ‘clinoptilolite' enriched with digestate nutrients to supply nitrogen (N) when used as a fertilizer. A pot experiment with ryegrass was conducted to test the effect of a nutrient-enriched biochar and clinoptilolite by determining plant biomass growth and N uptake. This included untreated biochar and clinoptilolite as controls and two levels of N application (15 and 45 mg N per pot) each at two initial loading ratios (low and high). Nutrient-enriched biochar and clinoptilolite increased plant biomass yield (up to 1.02 and 2.39 g per pot) and N uptake (up to 11.23 and 39.94 mg N per pot) compared to the untreated sorbents treatments. Initial loading ratio had a significant effect on plant biomass response and apparent N recovery (ANR) for enriched clinoptilolite, and lower initial loading ratio improved plant growth. In contrast to clinoptilolite, higher initial loading ratio resulted in higher ANR. In conclusion, our results reveal that N released from enriched clinoptilolite and biochar could be taken up by the plants, clinoptilolite performed more effectively than biochar, and initial loading ratio affected the performance of the sorbents when used as a fertilizer.

Bioavailability of α-tocopherol stereoisomers in lambs depends on dietary doses of all-rac- or RRR-α-tocopheryl acetate
Neto Leal, Leonel ; Jensen, S.K. ; Bello, J.M. ; Hartog, L.A. den; Hendriks, W.H. ; Martín-Tereso, Javier - \ 2019
Animal 13 (2019)9. - ISSN 1751-7311 - p. 1874 - 1882.
When supplementing lamb diets with vitamin E, an equivalence factor of 1.36 is used to discriminate between RRR-α-tocopheryl acetate and all-rac-α tocopheryl acetate. However, more recent studies suggest a need for new equivalence factors for livestock animals. The current study aimed to determine the effect of RRR- and all-rac-α-tocopheryl acetate supplementation on α-tocopherol deposition in lamb tissues. A total of 108 Rasa Aragonesa breed lambs were fed increasing amounts of all-rac-α-tocopheryl acetate (0.25, 0.5, 1.0 and 2.0 g/kg compound feed) or RRR-α-tocopheryl acetate (0.125, 0.25, 0.5 and 1.0 g/kg compound feed) by adding them to a basal diet that contained 0.025 g/kg feed of all-rac-α-tocopheryl acetate as part of the standard vitamin and mineral mixture. The diets were fed for the last 14 days before slaughtering at 25.8 ± 1.67 kg BW. Within 20 min after slaughter samples of muscle, heart, liver, brain and spleen were frozen at −20°C until α-tocopherol analysis. Increased supplementation of either vitamin E sources led to a significant increase ( P<0.001) in α-tocopherol concentration in all tissues studied. The tissue with the highest α-tocopherol concentration was the liver followed by spleen, heart and muscle. At similar supplementation levels (0.25, 0.50 and 1.0 g/kg compound feed), α-tocopherol content in the selected tissues was not affected by α-tocopherol source. However, the ratios between RRR- and all-rac α-tocopheryl acetate increased with the increasing α-tocopherol supplementation (at 0.25 and 1.0 g/kg compound feed), from 1.06 to 1.16 in muscle, 1.07 to 1.15 in heart, 0.91 to 0.94 in liver and 0.98 to 1.10 in spleen. The highest relative proportion of Ʃ2S (sum of SSS-, SSR-, SRS- and SRR-α tocopherol)-configured stereoisomers was found in the liver of lambs supplemented with all-rac-α-tocopheryl acetate accounting for up to 35 to 39% of the total α-tocopherol retained, whereas the proportion of Ʃ2S-configured stereoisomers in the other tissues accounted for <14%. Increasing all-rac-α-tocopheryl acetate supplementation was also found to affect the 2R-configured stereoisomer profile in muscle, heart and spleen with increasing proportions of RRS-, RSR- and RSS- at the cost of RRR-α-tocopherol. In all tissues, the relative proportion of all non-RRR-stereoisomers in lambs receiving RRR-α-tocopheryl acetate was lower than RRR-α-tocopherol. These results confirm that the relative bioavailability of RRR- and all-rac-α-tocopheryl acetate is dose- and tissue-dependent and that a single ratio to discriminate the two sources cannot be used.
Breeding progress and preparedness for mass-scale deployment of perennial lignocellulosic biomass crops switchgrass, miscanthus, willow and poplar
Clifton-Brown, John ; Harfouche, Antoine ; Casler, Michael D. ; Dylan Jones, Huw ; Macalpine, William J. ; Murphy-Bokern, Donal ; Smart, Lawrence B. ; Adler, Anneli ; Ashman, Chris ; Awty-Carroll, Danny ; Bastien, Catherine ; Bopper, Sebastian ; Botnari, Vasile ; Brancourt-Hulmel, Maryse ; Chen, Zhiyong ; Clark, Lindsay V. ; Cosentino, Salvatore ; Dalton, Sue ; Davey, Chris ; Dolstra, Oene ; Donnison, Iain ; Flavell, Richard ; Greef, Joerg ; Hanley, Steve ; Hastings, Astley ; Hertzberg, Magnus ; Hsu, Tsai Wen ; Huang, Lin S. ; Iurato, Antonella ; Jensen, Elaine ; Jin, Xiaoli ; Jørgensen, Uffe ; Kiesel, Andreas ; Kim, Do Soon ; Liu, Jianxiu ; McCalmont, Jon P. ; McMahon, Bernard G. ; Mos, Michal ; Robson, Paul ; Sacks, Erik J. ; Sandu, Anatolii ; Scalici, Giovanni ; Schwarz, Kai ; Scordia, Danilo ; Shafiei, Reza ; Shield, Ian ; Slavov, Gancho ; Stanton, Brian J. ; Swaminathan, Kankshita ; Trindade, Luisa M. - \ 2019
Global change biology Bioenergy 11 (2019)1. - ISSN 1757-1693 - p. 118 - 151.
bioenergy - feedstocks - lignocellulose - M. sacchariflorus - M. sinensis - Miscanthus - Panicum virgatum - perennial biomass crop - Populus spp. - Salix spp.

Genetic improvement through breeding is one of the key approaches to increasing biomass supply. This paper documents the breeding progress to date for four perennial biomass crops (PBCs) that have high output–input energy ratios: namely Panicum virgatum (switchgrass), species of the genera Miscanthus (miscanthus), Salix (willow) and Populus (poplar). For each crop, we report on the size of germplasm collections, the efforts to date to phenotype and genotype, the diversity available for breeding and on the scale of breeding work as indicated by number of attempted crosses. We also report on the development of faster and more precise breeding using molecular breeding techniques. Poplar is the model tree for genetic studies and is furthest ahead in terms of biological knowledge and genetic resources. Linkage maps, transgenesis and genome editing methods are now being used in commercially focused poplar breeding. These are in development in switchgrass, miscanthus and willow generating large genetic and phenotypic data sets requiring concomitant efforts in informatics to create summaries that can be accessed and used by practical breeders. Cultivars of switchgrass and miscanthus can be seed-based synthetic populations, semihybrids or clones. Willow and poplar cultivars are commercially deployed as clones. At local and regional level, the most advanced cultivars in each crop are at technology readiness levels which could be scaled to planting rates of thousands of hectares per year in about 5 years with existing commercial developers. Investment in further development of better cultivars is subject to current market failure and the long breeding cycles. We conclude that sustained public investment in breeding plays a key role in delivering future mass-scale deployment of PBCs.

Selecting mixtures on the basis of dietary exposure and hazard data : application to pesticide exposure in the European population in relation to steatosis
Crépet, Amélie ; Vanacker, Marie ; Sprong, Corinne ; Boer, Waldo de; Blaznik, Urska ; Kennedy, Marc ; Anagnostopoulos, Chris ; Christodoulou, Despo Louca ; Ruprich, Jiří ; Rehurkova, Irena ; Domingo, José Luis ; Hamborg Jensen, Bodil ; Metruccio, Francesca ; Moretto, Angelo ; Jacxsens, Liesbeth ; Spanoghe, Pieter ; Senaeve, David ; Voet, Hilko van der; Klaveren, Jacob van - \ 2019
International Journal of Hygiene and Environmental Health 222 (2019)2. - ISSN 1438-4639 - p. 291 - 306.
Cumulative assessment group - Dietary exposure and hazard - Mixture prioritisation - Relative potency factors - Sparse non-negative matrix underestimation

Populations are exposed to mixtures of pesticides through their diet on a daily basis. The question of which substances should be assessed together remains a major challenge due to the complexity of the mixtures. In addition, the associated risk is difficult to characterise. The EuroMix project (European Test and Risk Assessment Strategies for Mixtures) has developed a strategy for mixture risk assessment. In particular, it has proposed a methodology that combines exposures and hazard information to identify relevant mixtures of chemicals belonging to any cumulative assessment group (CAG) to which the European population is exposed via food. For the purposes of this study, food consumption and pesticide residue data in food and drinking water were obtained from national surveys in nine European countries. Mixtures of pesticides were identified by a sparse non-negative matrix underestimation (SNMU) applied to the specific liver steatosis effect in children from 11 to 15 years of age, and in adults from 18 to 64 years of age in nine European countries. Exposures and mixtures of 144 pesticides were evaluated through four different scenarios: (1) chronic exposure with a merged concentration dataset in the adult population, (2) chronic exposure with country-specific concentration datasets in the adult population, (3) acute exposure with a merged concentration dataset in the adult population, and (4) chronic exposure with a merged concentration dataset in the paediatric population. The relative potency factors of each substance were calculated to express their potency relative to flusilazole, which was chosen as the reference compound. The selection of mixtures and the evaluation of exposures for each country were carried out using the Monte Carlo Risk Assessment (MCRA) software. Concerning chronic exposure, one mixture explained the largest proportion of the total variance for each country, while in acute exposure, several mixtures were often involved. The results showed that there were 15 main pesticides in the mixtures, with a high contribution of imazalil and dithiocarbamate. Since the concentrations provided by the different countries were merged in the scenario using merged concentration data, differences between countries result from differences in food consumption behaviours. These results support the approach that using merged concentration data to estimate exposures in Europe seems to be realistic, as foods are traded across European borders. The originality of the proposed approach was to start from a CAG and to integrate information from combined exposures to identify a refined list of mixtures with fewer components. As this approach was sensitive to the input data and required significant resources, efforts should continue regarding data collection and harmonisation among the different aspects within the pesticides regulatory framework, and to develop methods to group substances and mixtures to characterise the risk.

What is animal happiness?
Webb, Laura E. ; Veenhoven, Ruut ; Harfeld, Jes Lynning ; Jensen, Margit Bak - \ 2019
Annals of the New York Academy Of Sciences 1438 (2019)1. - ISSN 0077-8923 - p. 62 - 76.
affect balance - animal welfare - human happiness - typical level of affect

Today, we see a growing concern for the quality of life of nonhuman animals and an accompanying call for viable means of assessing how well animals thrive. Past research focused on minimizing negatives such as stress, while more recent endeavors strive to promote positives such as happiness. But what is animal happiness? Although often mentioned, the term lacks a clear definition. With recent advances in the study of animal emotion, current interest into positive rather than negative experiences, and the call for captive and domesticated animals to have good lives, the time is ripe to examine the concept of animal happiness. We draw from the human and animal literature to delineate a concept of animal happiness and propose how to assess it. We argue that animal happiness depends on how an individual feels generally—that is, a typical level of affect.

Testing theoretical explanations for investment behaviour in the Dutch beam trawler fishery in the North Sea
Jensen, Frank ; Elleby, Christian ; Hamon, Katell G. ; Weegh, Jos op de - \ 2019
Applied Economics 51 (2019)21. - ISSN 0003-6846 - p. 2233 - 2248.
conventional fishing - Fisheries - investments - pulse fishing

In this study, we investigate whether the neoclassical economic theory, capital market frictions or preference-based theory can explain investment behaviour in the Dutch beam trawler fishery in the North Sea. By presenting a number of estimations, we show that vessels conducting pulse fishing invest substantially more than similar vessels undertaking conventional fishing, even after controlling for differences in such variables as capital stock, prices, profits and quotas. One possible explanation for this result is that vessel owners may obtain a separate benefit from investing in pulse fishing.

Research challenges for cultural ecosystem services and public health in (peri-)urban environments
Chen, Xianwen ; Vries, Sjerp de; Assmuth, Timo ; Dick, Jan ; Hermans, Tia ; Hertel, Ole ; Jensen, Anne ; Jones, Laurence ; Kabisch, Sigrun ; Lanki, Timo ; Lehmann, Irina ; Maskell, Lindsay ; Norton, Lisa ; Reis, Stefan - \ 2019
Science of the Total Environment 651 (2019). - ISSN 0048-9697 - p. 2118 - 2129.
Cultural ecosystem services - Nature-based solutions - Public health - Urban green/blue infrastructure

Urbanization is a global trend, and consequently the quality of urban environments is increasingly important for human health and wellbeing. Urban life-style is typically associated with low physical activity and sometimes with high mental stress, both contributing to an increasing burden of diseases. Nature-based solutions that make effective use of ecosystem services, particularly of cultural ecosystem services (CES), can provide vital building blocks to address these challenges. This paper argues that, the salutogenic, i.e. health-promoting effects of CES have so far not been adequately recognised and deserve more explicit attention in order to enhance decision making around health and wellbeing in urban areas. However, a number of research challenges will need to be addressed to reveal the mechanisms, which underpin delivery of urban CES. These include: causal chains of supply and demand, equity, and equality of public health benefits promoted. Methodological challenges in quantifying these are discussed. The paper is highly relevant for policy makers within and beyond Europe, and also serves as a review for current researchers and as a roadmap to future short- and long-term research opportunities.

Some personal reflections on the social production of multiple natures
Macnaghten, Philip ; Jensen, Ole B. ; Kesselring, Sven ; Sheller, Mimi - \ 2018
In: Mobilities and Complexities Routledge, Taylor & Francis Group - ISBN 9780429470097 - p. 64 - 69.
The new ‘mobilities turn’ has become a powerful perspective in social theory. John Urry’s oeuvre has been very influential in the emergence of this new field and has had lasting impacts on many scholars. This collection presents originally commissioned essays from leading scholars in the field who reflect on how Urry’s writing influenced the course of their research and theorizing.

This volume gathers contributions in relation to John Urry’s path-breaking work. The new ‘mobilities turn’ made a strong imprint in European social theory and is beginning to make an impact in the Americas and Asia as well. It challenges mainstream theoretical and empirical approaches that were grounded in a sedentary and bounded view of states. It propels innovative thinking about social and media ecologies, complex systems and social change. It bridges many disciplines and methodologies, leading to new approaches to existing problems while also resonating with questions about both history and the future. Mobilities research marks the rise of academic and intellectual cooperation and collaboration ‘beyond societies’, as nations around the world face the ecological limits of contemporary mobility and energy systems.

The contributors represent several national contexts, including England, Germany, Denmark, Finland, Taiwan, Brazil, Canada, Australia and the USA. This book collects personal essays and gives insight into a vivid network of scientists who have connections of various degrees to the late John Urry as an academic figure, an author and a person.
1662: Koffie, wereldhandel en de consumptie-revolutie
Zwart, P. de - \ 2018
In: Wereldgeschiedenis van Nederland / 't Hart, M., Davids, K., Fatah-Black, K., Heerma van Voss, L., Lucassen, L., Touwen, J., Amsterdam : - ISBN 9789026343995 - p. 275 - 280.
In Wereldgeschiedenis van Nederland vertellen meer dan honderd aanstormende en gevestigde Nederlandse onderzoekers op het gebied van geschiedenis en cultuur het wereldwijde verhaal van onze geschiedenis, onder wie Martine Gosselink, Beatrice de Graaf, Lotte Jensen, Gert Oostindie, Lodewijk Petram en Suze Zijlstra. In dit verhelderende en prikkelende boek laten zij zien hoe Nederland de wereld door de eeuwen heen mede heeft vormgegeven, en andersom: hoe Nederland zich onder invloed van verre en nabije buren heeft ontwikkeld. Van de vondst van oermens Krijn in de Noordzee tot orkaan Irma op Sint Maarten en van Bonifatius tot Pim Fortuyn – aan de hand van talloze grote en kleine historische ontwikkelingen en gebeurtenissen laat Wereldgeschiedenis van Nederland zien hoezeer Nederland verbonden is met de wereld, en de wereld met Nederland. Wereldgeschiedenis van Nederland is een uitgave van het Huygens Instituut voor Nederlandse Geschiedenis, een knaw-onderzoeksinstituut op het gebied van geschiedenis en literatuur.

Redactie: Karel Davids, Karwan Fatah-Black, Marjolein ’t Hart, Leo Lucassen en Jeroen Touwen. Hoofdredactie: Lex Heerma van Voss
Estimation of genetic parameters for body weight and feed efficiency traits in a broiler chicken population using genomic information.
Mebratie, Wossenie ; Bovenhuis, H. ; Jensen, Just - \ 2018
In: Proceedings of the World Congress on Genetics Applied to Livestock Production. - - 4 p.
In this study, data from an experimental broiler chicken population from Cobb-Vantress were obtained for analysis. A total of 1000 broilers were tested in a feed efficiency (FE) experiment. Genetic parameters of body weight (BW) and FE traits were estimated using genomic information. The heritability estimates of BW and FE traits for this line were found to be lower than those reported in other studies, which are estimated based on pedigree relations. The observed low estimates in this study might be due to pre-selection of the broilers for BW before the FE experiment, weak relationship between broilers in the data and use of only genomic information to enable estimation of genetic parameters since there was no available pedigree information for this population. Key words: Feed conversion ratio, body weight, broiler chicken, heritability, genomic information.
Combined lifestyle interventions for vulnerable citizens : What works best?
Mulderij, L.S. ; Wagemakers, A. ; Verkooijen, K.T. - \ 2018
In: Implementing Health Promotion in the Life Course - User Involvement in Practice and Research. - - p. 105 - 106.
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