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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Operationalizing the concept of robustness of nitrogen networks in mixed smallholder systems: A pilot study in the mid-hills and lowlands of Nepal
Alomia-Hinojosa, Victoria ; Groot, Jeroen C.J. ; Speelman, Erika N. ; Bettinelli, Carlo ; Mcdonald, Andrew J. ; Alvarez, Stephanie ; Tittonell, Pablo - \ 2020
Ecological Indicators 110 (2020). - ISSN 1470-160X
Nitrogen (N) is often the most limiting nutrient to productivity in smallholder mixed crop-livestock systems such as commonly found in the mid-hills and lowland (Terai) of Nepal. Identifying current bottlenecks constraining agroecosystem functioning in terms of N flows and associated improvement options in these systems is paramount. Here, we explore variations in robustness, a concept from ecological network analysis (ENA) which represents the balance of system’s degree of order between organization (order/constraint) and adaptive flexibility (freedom/resilience) of N flows. Robustness can provide a detailed assessment of N flows and assist in evaluation of measures to reduce nutrient losses. In this study, the FarmDESIGN model was employed to quantify nitrogen flows, generate ENA indicators of integration, diversity and robustness, and to explore the impact of crop intensification options on N networks across farm types in the mid-hills and lowland (Terai) of Nepal. Results revealed that the farms in the different agroecosystems recycled only a small portion of the total N inputs (<15%), and had therefore high rates of N losses (63–1135 kg N per ha per year) and high dependency on N imports in the form of fodder (feed self-reliance 11–43%). The farm N networks were organised (high productivity) but inflexible (poorly resilient) and consequently unbalanced (low robustness). Scenarios of improved management (improved seed, intercropping, use of fertilizers, better timing of activities) resulted in improved crop production, leading to reduced fodder imports and less N losses. Consequently, the N networks increased in flexibility which resulted in greater robustness of the N flow network in the farm systems. Increasing on-farm biomass production by improved farm management could be an important element on the way to sustainably intensify smallholder farms, especially when dependency on external resources can be reduced. We conclude that a detailed analysis of nutrient flows and their robustness is a suitable instrument for targeted improvement of nutrient use in smallholder crop-livestock systems.
Multi-level socioecological drivers of agrarian change: Longitudinal evidence from mixed rice-livestock-aquaculture farming systems of Bangladesh
Aravindakshan, Sreejith ; Krupnik, Timothy J. ; Groot, Jeroen C.J. ; Speelman, Erika N. ; Amjath- Babu, T.S. ; Tittonell, Pablo - \ 2020
Agricultural Systems 177 (2020). - ISSN 0308-521X
Coastal systems are facing natural and human-driven change coupled with a rising population. With increasing shifts in socioecological conditions during the past several decades, it is important to understand how socioecological drivers at different hierarchical levels: -micro, -meso, and -macro affect coastal farming systems, which play a crucial role in the livelihoods of coastal dwellers. Mixed rice-livestock-aquaculture farming in Southern Bangladesh exemplifies the rapid change occurring in many of the world's coastal farming systems in response to these drivers. We used panel data observations from the above study area and modeled trajectories of farm typologies, and the impact of multi-level socioecological drivers by a novel approach. Our approach integrates: (1) a well-articulated conceptual frame of change observed using (2) a temporal view of the potential drivers, change process and farm type outcomes, with the twenty years panel data of 502 households that is analyzed by means of (3) multivariate statistics in conjunction with panel data models that operationalize the conceptual frame. Our approach allows (a) estimating dynamic effects over time that typically cannot be estimated in a cross-sectional data set, (b) distinguishing between time-invariant fixed and time dependent random effects of multi-level socioecological drivers, and (c) controlling for omitted variables to a certain extent. Considering farming systems both within and outside of polder embankment systems intended to protect against oceanic water intrusion, we found a gradual shift from heterogeneous, rice-livestock farm types to more homogenous farms with less livestock and more off-farm activities. Micro-level factors including farm plot fragmentation, farmers' experience in cropping, machinery, salinity and soil fertility were influencing changes in farming systems. Meso-level factors including markets, road infrastructure, labor availability, access to extension and land tenure also affect the trajectory of farming systems change. Among macro-level drivers, increasing population density positively and significantly influenced cropping intensity among farms outside polder systems. Within polders, a positive but non-significant trend was observed for the influence of population density on cropping intensity. Our data also indicate negative and significant influence of cyclonic storms on cropping intensity over time in both areas. Our results underscore the importance of accounting for multiple levels of socioecological drivers of change when developing appropriate policy options for sustainable development in South Asia's coastal farming systems.
Genetische monitoring van de Nederlandse otterpopulatie : Ontwikkeling van populatieomvang en genetische status 2018/2019
Kuiters, A.T. ; Groot, G.A. de; Lammertsma, D.R. ; Jansman, H.A.H. ; Bovenschen, J. ; Boerwinkel, M.C. ; Laar, M. - \ 2019
Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 157) - 54
The Dutch otter population is surveyed each year for the Ministry of Agriculture, Nature and Food Quality to monitor its size, distribution and genetic status. DNA is isolated from spraints and tissue from dead individuals, and data is obtained on the demographic processes of reproduction, mortality, immigration and emigration. The resulting information is also used to detect changes in the spatial distribution and size of the population. Based on the DNA profiles identified during the monitoring in 2018/2019, the population is now estimated to consist of approx. 360 individuals. The population has therefore grown steadily. The number of traffic victims increased strongly in 2018 and was proportionately larger than the increase in population size. The list of roadkill hotspots has been updated. The total amount of genetic variation at the population level seems to be stabilising, as does the average genetic variation within individuals. This underlines the importance of immigration of otters from German populations near the Dutch-German border. Although incidental, this was more frequent than in the previous year. A particularly hopeful sign is that there appear to be three different immigration routes, through the provinces of Groningen, Overijssel and Gelderland.
The skin-deep beauty of dairy cows : Investigation of metabolic disorders by using morphological traits quantified with 3-Dimensional vision
Song, Xiangyu - \ 2019
Wageningen University. Promotor(en): P.W.G. Groot Koerkamp, co-promotor(en): E.A.M. Bokkers; P.P.J. van der Tol. - Wageningen : Wageningen University - ISBN 9789463950794 - 121
Dietary protein and resistance exercise training for community-dwelling older adults : Intervention adaptation, implementation and effectiveness
Dongen, Ellen J.I. van - \ 2019
Wageningen University. Promotor(en): C.P.G.M. de Groot, co-promotor(en): A. Haveman-Nies; E.L. Doets. - Wageningen : Wageningen University - ISBN 9789463951098 - 247
Alternative Oxidase (AOX) Senses Stress Levels to Coordinate Auxin-Induced Reprogramming From Seed Germination to Somatic Embryogenesis—A Role Relevant for Seed Vigor Prediction and Plant Robustness
Mohanapriya, Gunasekaran ; Bharadwaj, Revuru ; Noceda, Carlos ; Costa, José Hélio ; Kumar, Sarma Rajeev ; Sathishkumar, Ramalingam ; Thiers, Karine Leitão Lima ; Santos Macedo, Elisete ; Silva, Sofia ; Annicchiarico, Paolo ; Groot, Steven P.C. ; Kodde, Jan ; Kumari, Aprajita ; Gupta, Kapuganti Jagadis ; Arnholdt-Schmitt, Birgit - \ 2019
Frontiers in Plant Science 10 (2019). - ISSN 1664-462X
developmental plasticity - endophytes - environmental stress - metabolic biomarker - plant performance prediction - seed technology

Somatic embryogenesis (SE) is the most striking and prominent example of plant plasticity upon severe stress. Inducing immature carrot seeds perform SE as substitute to germination by auxin treatment can be seen as switch between stress levels associated to morphophysiological plasticity. This experimental system is highly powerful to explore stress response factors that mediate the metabolic switch between cell and tissue identities. Developmental plasticity per se is an emerging trait for in vitro systems and crop improvement. It is supposed to underlie multi-stress tolerance. High plasticity can protect plants throughout life cycles against variable abiotic and biotic conditions. We provide proof of concepts for the existing hypothesis that alternative oxidase (AOX) can be relevant for developmental plasticity and be associated to yield stability. Our perspective on AOX as relevant coordinator of cell reprogramming is supported by real-time polymerase chain reaction (PCR) analyses and gross metabolism data from calorespirometry complemented by SHAM-inhibitor studies on primed, elevated partial pressure of oxygen (EPPO)–stressed, and endophyte-treated seeds. In silico studies on public experimental data from diverse species strengthen generality of our insights. Finally, we highlight ready-to-use concepts for plant selection and optimizing in vivo and in vitro propagation that do not require further details on molecular physiology and metabolism. This is demonstrated by applying our research & technology concepts to pea genotypes with differential yield performance in multilocation fields and chickpea types known for differential robustness in the field. By using these concepts and tools appropriately, also other marker candidates than AOX and complex genomics data can be efficiently validated for prebreeding and seed vigor prediction.

A global synthesis reveals biodiversity-mediated benefits for crop production
Dainese, Matteo ; Martin, Emily A. ; Aizen, Marcelo A. ; Albrecht, Matthias ; Bartomeus, Ignasi ; Bommarco, Riccardo ; Carvalheiro, Luisa G. ; Chaplin-Kramer, Rebecca ; Gagic, Vesna ; Garibaldi, Lucas A. ; Ghazoul, Jaboury ; Grab, Heather ; Jonsson, Mattias ; Karp, Daniel S. ; Kennedy, Christina M. ; Kleijn, David ; Kremen, Claire ; Landis, Douglas A. ; Letourneau, Deborah K. ; Marini, Lorenzo ; Poveda, Katja ; Rader, Romina ; Smith, Henrik G. ; Tscharntke, Teja ; Andersson, Georg K.S. ; Badenhausser, Isabelle ; Baensch, Svenja ; Bezerra, Antonio D.M. ; Bianchi, Felix J.J.A. ; Boreux, Virginie ; Bretagnolle, Vincent ; Caballero-Lopez, Berta ; Cavigliasso, Pablo ; Ćetković, Aleksandar ; Chacoff, Natacha P. ; Classen, Alice ; Cusser, Sarah ; Silva E Silva, Felipe D. Da; Groot, A. de; Dudenhöffer, Jan H. ; Ekroos, Johan ; Fijen, Thijs ; Franck, Pierre ; Freitas, Breno M. ; Garratt, Michael P.D. ; Gratton, Claudio ; Hipólito, Juliana ; Holzschuh, Andrea ; Hunt, Lauren ; Iverson, Aaron L. ; Jha, Shalene ; Keasar, Tamar ; Kim, Tania N. ; Kishinevsky, Miriam ; Klatt, Björn K. ; Klein, Alexandra Maria ; Krewenka, Kristin M. ; Krishnan, Smitha ; Larsen, Ashley E. ; Lavigne, Claire ; Liere, Heidi ; Maas, Bea ; Mallinger, Rachel E. ; Pachon, Eliana Martinez ; Martínez-Salinas, Alejandra ; Meehan, Timothy D. ; Mitchell, Matthew G.E. ; Molina, Gonzalo A.R. ; Nesper, Maike ; Nilsson, Lovisa ; O'Rourke, Megan E. ; Peters, Marcell K. ; Plećaš, Milan ; Potts, Simon G. ; L. Ramos, Davi de; Rosenheim, Jay A. ; Rundlöf, Maj ; Rusch, Adrien ; Sáez, Agustín ; Scheper, Jeroen ; Schleuning, Matthias ; Schmack, Julia M. ; Sciligo, Amber R. ; Seymour, Colleen ; Stanley, Dara A. ; Stewart, Rebecca ; Stout, Jane C. ; Sutter, Louis ; Takada, Mayura B. ; Taki, Hisatomo ; Tamburini, Giovanni ; Tschumi, Matthias ; Viana, Blandina F. ; Westphal, Catrin ; Willcox, Bryony K. ; Wratten, Stephen D. ; Yoshioka, Akira ; Zaragoza-Trello, Carlos ; Zhang, Wei ; Zou, Yi ; Steffan-Dewenter, Ingolf - \ 2019
Science Advances 5 (2019)10. - ISSN 2375-2548

Human land use threatens global biodiversity and compromises multiple ecosystem functions critical to food production. Whether crop yield-related ecosystem services can be maintained by a few dominant species or rely on high richness remains unclear. Using a global database from 89 studies (with 1475 locations), we partition the relative importance of species richness, abundance, and dominance for pollination; biological pest control; and final yields in the context of ongoing land-use change. Pollinator and enemy richness directly supported ecosystem services in addition to and independent of abundance and dominance. Up to 50% of the negative effects of landscape simplification on ecosystem services was due to richness losses of service-providing organisms, with negative consequences for crop yields. Maintaining the biodiversity of ecosystem service providers is therefore vital to sustain the flow of key agroecosystem benefits to society.

Samenwerken in de regio: investeren in een circulaire economie : Longread
Schoumans, O.F. ; Regelink, I.C. ; Haas, W. de; Kranendonk, R.P. ; Kistenkas, F.H. - \ 2019
Wageningen : Wageningen University & Research
Nederland staat aan het begin van de transitie naar een circulaire economie. Wageningse wetenschappers zoeken daarom naar kansen en oplossingen, do's en don'ts. Zo coördineert Wageningen University & Research een groot Europees project, waarbij voedingsstoffen als fosfaat en stikstof worden teruggewonnen uit mest. Dit is een belangrijke stap op weg naar een gesloten kringloop.
De kracht van eiwit
Groot, C.P.G.M. de - \ 2019

Diëtiste ontwikkelt hoogwaardig ontbijtproduct voor senioren.

Brongerichte maatregelen voor beperking emissies uit bestaande varkensstallen
Aarnink, André ; Groot, Jos de; Ogink, Nico - \ 2019
Wageningen : Wageningen Livestock Research (Wageningen Livestock Research rapport 1205) - 29
The coalition Vitalization of pig farming has taken the initiative, with the provinces and LNV, for a source-oriented sustainability improvement of pig houses. The objective is that harmful emissions from pig houses are prevented as far as possible directly from the source and integral. This report provides insight into the points of application and the measures that can be taken to reduce emissions integrally at the source in existing housing for the different categories of pigs. The perspective of possible measures, the impact on emissions and the possibility of combining measures, possibly with end-of-pipe solutions, are indicated. In addition, insight is provided into current initiatives in this field in the Netherlands and abroad.
Vitaal ouder worden
Groot, C.P.G.M. de - \ 2019
Wageningen : Wageningen University & Research
Als we ouder worden nemen onze spierkracht en –massa af. Maar we kunnen dit proces keren, ontdekten Wageningse voedingswetenschappers. Eiwitrijke voeding en krachttraining zorgen ervoor dat de oudere mens sterker wordt, een betere balans krijgt en weer soepeler opstaat uit de stoel. Dit blijkt uit onderzoek van de afdeling Humane Voeding in Wageningen, die dit jaar vijftig jaar bestaat. Wat zou jij willen weten over voeding voor ouderen?
The Newly Developed Elderly Nutrient-Rich Food Score Is a Useful Tool to Assess Nutrient Density in European Older Adults
Berendsen, Agnes A.M. ; Kramer, Charlotte S. ; Groot, Lisette C.P.G.M. de - \ 2019
Frontiers in Nutrition 6 (2019). - ISSN 2296-861X
diet - diet quality - elderly - nutrient density - nutrient profiling - nutrient-rich food index

Objective: To develop a nutrient-rich food (NRF) score that captures dietary reference values for older adults and to validate this against a diet index that was specifically designed to assess adherence to dietary guidelines for the older population. Design: A cross-sectional study within the Dutch National Food Consumption Survey (DNFCS, n = 735 men and women aged 70–94 years, enrolled between October 2010 and February 2012) and within the NU-AGE study (n = 250 men and women aged 65–79 years, enrolled between April 2012 and March 2013). Dietary intake was assessed by means of two non-consecutive dietary record assisted 24-h recalls and 7-day food records, respectively. Structured questionnaires collected data on lifestyle and socio-economic information. Anthropometrics were measured by trained dieticians or research assistants. We evaluated Elderly NRF (E-NRF) scores against the NU-AGE index, a measure of adherence to European dietary guidelines for the aging population. The E-NRF scores were composed of nutrients that: (1) have been shown to be of inadequate intake in the aging population (>20%), (2) were defined as nutrients of public health relevance, and (3) were associated with relevant health outcomes. Results: The E-NRF score that best predicted the NU-AGE index included seven nutrients to encourage (protein, dietary fiber, folate, vitamin D, calcium, magnesium, potassium) and three nutrients to limit (saturated fat, sodium and mono- and disaccharides) on a 100-kcal basis, the E-NRF7.3 score (model R2 0.27 in DNFCS and 0.41 in NU-AGE). Food groups contributing the most to the individual E-NRF7.3 scores were vegetables, bread, potatoes and milk and milk products. Conclusion: The E-NRF7.3 score is a useful tool for assessing nutrient density of diets within the older population. No index has previously been developed with the aim of evaluating nutrient density of diets and foods specifically capturing dietary reference values for older adults.

Resilience of yak farming in Bhutan
Dorji, Nedup ; Derks, M. ; Dorji, P. ; Groot Koerkamp, P.W.G. ; Bokkers, Eddie - \ 2019
In: Book of abstracts of the 70th Annual Meeting of the European Federation of Animal Science. - Wageningen : Wageningen Academic Publishers (Book of abstracts 25) - ISBN 9789086863396 - p. 426 - 426.
'Rattenplaag wordt groter in Nederland'
Meerburg, B.G. - \ 2019
Evaluation of The Traditional Use of Some Yemeni Plants for the Treatment of Some Livestock Diseases
Alasbahi, R. ; Groot, M.J. - \ 2019
Livestock is an important and integral component of agriculture production in Yemen. Animal production contributes by 28% of the total agricultural production income. The most important animals available in Yemen are cows, sheep, goats, donkeys, camels, horses, and chickens. Livestock caring is a matter of constant concern for the rural population and 95% of labour force in rural areas are women who are mostly responsible for livestock rearing, and mostly possess knowledge specific to treating sick animals1,2. Limited research has been conducted on the biological and toxicological activities of plants used for ethnoveterinary purposes in Yemen. Therefore, the aim of our work was to confirm the traditional use of some documented plants used in the ethnoveterinary medicine based on scientific evaluation of their bioactivity and toxic properties.
Randomized Controlled Trial of Exercise and Nutrition Supplementation on Physical and Cognitive Function in Older Chinese Adults Aged 50 Years and Older
Woo, Jean ; Chan, Ruth ; Ong, Sherlin ; Bragt, Marjolijn ; Bos, Rolf ; Parikh, Panam ; Groot, Lisette C.P.G.M. de - \ 2019
Journal of the American Medical Directors Association (2019). - ISSN 1525-8610
cognitive function - Exercise - nutrition - older adults - physical performance - self-rated health

Objectives: To assess whether a 24-week multidomain lifestyle intervention including a nutritional milk supplement and an exercise program had any effect on physical and cognitive function, self-rated health, and health-related quality of life in older Chinese adults. Design: Randomized controlled trial. Setting and participants: Community-living people aged 50 years and older. Methods: 180 participants (mean age 61 ± 6 years) were randomized to 24 weeks of exercise plus nutrition supplementation or no intervention. The primary outcome was gait speed, with additional physical and cognitive function measures, self-rated health, and health-related quality of life as secondary outcomes. Information collected also included dietary intake by 3-day dietary records, and blood sampling for renal function, glycated hemoglobin, serum vitamin B12, 25-hydroxyvitamin D, and biochemical indices of bone turnover. Results: There was no significant group difference in the change of gait speed, muscle strength, muscle power, cardiovascular fitness, or cognitive function over time, either by intention-to-treat or per-protocol analysis. A significant time × group effect (P = .039) on self-rated health was detected, but there was no significant time or time × group difference in the change of physical and mental health-related quality of life measures over time. In addition, moderate physical activity level was greatly increased from baseline to 24 weeks in the intervention group compared with the control group. Conclusions and implications: A 24-week exercise and nutrition supplementation program among community-living people in late midlife to early old age improved self-rated health and the overall level of physical activity, without objective improvements in physical and cognitive function.

The power to define resilience in social–hydrological systems: Toward a power‐sensitive resilience framework
Dewulf, Art ; Karpouzoglou, Timos ; Warner, Jeroen ; Wesselink, Anna ; Mao, Feng ; Vos, Jeroen ; Tamas, Peter ; Groot, Annemarie E. ; Heijmans, Annelies ; Ahmed, Farhana ; Hoang, Long ; Vij, Sumit ; Buytaert, Wouter - \ 2019
Wiley Interdisciplinary Reviews: Water 6 (2019)6. - ISSN 2049-1948
Since the early work on defining and analyzing resilience in domains such as engineering, ecology and psychology, the concept has gained significant traction in many fields of research and practice. It has also become a very powerful justification for various policy goals in the water sector, evident in terms like flood resilience, river resilience, and water resilience. At the same time, a substantial body of literature has developed that questions the resilience concept's systems ontology, natural science roots and alleged conservatism, and criticizes resilience thinking for not addressing power issues. In this study, we review these critiques with the aim to develop a framework for power‐sensitive resilience analysis. We build on the three faces of power to conceptualize the power to define resilience. We structure our discussion of the relevant literature into five questions that need to be reflected upon when applying the resilience concept to social–hydrological systems. These questions address: (a) resilience of what, (b) resilience at what scale, (c) resilience to what, (d) resilience for what purpose, and (e) resilience for whom; and the implications of the political choices involved in defining these parameters for resilience building or analysis. Explicitly considering these questions enables making political choices explicit in order to support negotiation or contestation on how resilience is defined and used.
Vulkaan herstelt mogelijk Groot Barrièrerif
Becking, L.E. - \ 2019
Ecologisch gericht suppleren: meetplan strandsurvey 2019
Geest, Matthijs van der; Tulp, Ingrid ; Hal, Ralf van - \ 2019
Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport C045/19) - 25
Suppleties van zand op vooroever of strand worden in opdracht van Rijkswaterstaat uitgevoerd om de Nederlandse kust tegen erosie te beschermen en om voldoende zand in het kustfundament te houden. Een groot deel van de suppleties vindt plaats in of nabij de kuststrook die binnen de Natura2000 kaders wordt beschermd, de Noordzeekustzone. Het is dus van belang de eventuele effecten van deze praktijk op de natuur zorgvuldig te bestuderen, zodat dit effect kan worden afgezet tegen het algemene nut voor de maatschappij. Betere kennis van de effecten kan leiden tot beperking van eventuele schade aan en mogelijk zelfs tot versterking van gewenste natuurwaarden en ecosysteemdiensten. Tot nog toe is er vooral aandacht geweest voor de gevolgen van suppleren op benthos en weinig voor de mogelijke effecten op vispopulaties, terwijl de ondiepe kustzone als kinderkamer voor vis een zeer belangrijke economische ecosysteemdienst levert. Kennis van de habitatfactoren die het voorkomen van juveniele vis in kinderkamers bepalen leidt tot een verbeterd inzicht van de gevolgen van suppleties op vispopulaties en van de voedselketen van viseters in de ondiepe kustzone. De kennisinstituten Deltares en Wageningen Marine Research hebben te samen in overleg met natuurorganisaties in 2016 het document `Ecologische effecten van zandsuppleties’ (Herman et al. 2016) geschreven met als doel onderzoek te formuleren naar ecologische effecten van zandsuppleties. In het onderdeel ‘uitvoeringsplan’ (deel C in Herman et al. 2016) zijn 3 onderzoekslijnen (ook wel Krachtlijnen genoemd) gedefinieerd, te weten: Vooroever, Duinen en Waddenzee. Het hier beschreven meetplan voor een strandsurvey in 2019 valt onder de onderzoekslijn Vooroever. De onderzoeksvraag luidt: “Wat zijn de cumulatieve gevolgen van reguliere suppleties op samenstelling en functioneren van het ecosysteem van de ondiepe vooroever van de Nederlandse kust?”. Deze volgt uit de prioritering van de krachtlijn Vooroever: (cumulatieve) gevolgen van reguliere suppleties op samenstelling en functioneren van het ecosysteem van de vooroever. Conform het plan van aanpak voor dit programma (Herman et al. 2016) wordt voorgesteld om een strandsurvey uit te voeren in de brandingszone (<1 m diepte), waarbij vis, benthos en habitatkarakteristieken worden bemonsterd. Deze strandsurvey is daarmee een onderdeel van een groter pakket van geplande dataverzameling in het kader van Ecologisch Gericht Suppleren II/Natuurlijk Veilig. Het hoofddoel van de strandsurvey is om gedurende het voorjaar (maart-juni) iedere 2 à 3 weken op drie verschillende locaties data te verzamelen over aantallen, conditie, groei en dieet van juveniele platvis in de brandingszone in relatie tot relevante omgevingsvariabelen, zowel abiotisch als biotisch. De survey zal inzicht verschaffen wanneer en in welke mate de brandingszone in die periode gebruikt wordt als kinderkamer voor jonge platvis en in hoeverre dit gebruik en conditie, groei, en dieet afhangen van biotische en abiotische omgevingsvariabelen en of dit verschilt per platvissoort. Dit rapport beschrijft de meetstrategie, de meetmethoden, de te meten variabelen (vis, benthos en omgevingsvariabelen) en de bemonsteringslocaties voor de strandsurvey 2019.
Hot topic: Automated assessment of reticulo-ruminal motility in dairy cows using 3-dimensional vision
Song, X. ; Tol, P.P.J. van der; Groot Koerkamp, P.W.G. ; Bokkers, E.A.M. - \ 2019
Journal of Dairy Science 102 (2019)10. - ISSN 0022-0302 - p. 9076 - 9081.
3-dimensional camera - automatic - dairy cattle - ruminal motility

Reticulo-ruminal motility is a well-established indicator of gastrointestinal health in dairy cows. The currently available methods for assessing motility are labor-intensive, costly, and impractical to use regularly for all cows on a farm. We hypothesized that the reticulo-ruminal motility of dairy cows could be assessed automatically and remotely using a low-cost 3-dimensional (3D) camera. In this study, a 3D vision system was constructed and mounted on the frame of an automatic milking robot to capture the left paralumbar fossa of 20 primiparous cows. For each cow, the system recorded 3D images at 30 frames per second during milking. Each image was automatically processed to locate the left paralumbar fossa region and quantify its average concavity. Then, the average concavity values from all images of 1 cow during 1 milking process were chronologically assembled to form an undulation signal. By applying fast Fourier transformation to the signal, we identified cyclic oscillations that occurred in the same frequency range as reticulo-ruminal contractions. To validate the oscillation identification, 2 trained assessors visually identified reticulo-ruminal contractions from the same 3D image recordings on screen. The matching sensitivity between the automatically identified oscillations and the manually identified reticulo-ruminal contractions was 0.97. This 3D vision system can automate the assessment of reticulo-ruminal motility in dairy cows. It is noninvasive and can be implemented on farms without distressing the cows. It is a promising tool for farmers, giving them regular information about the gastrointestinal health of individual cows and helping them in daily farm management.

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