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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Amazing Grazing: science in support of future grass based dairy systems
Schils, R.L.M. ; Philipsen, A.P. ; Holshof, G. ; Zom, R.L.G. ; Hoving, I.E. ; Reenen, C.G. van; Werf, J.T.N. van der; Galama, P.J. ; Sebek, L.B. ; Klootwijk, C.W. ; Eekeren, N. van; Hoekstra, N.J. ; Stienezen, M.W.J. ; Pol, A. van den - \ 2018
In: Sustainable meat and milk production from grasslands. - Wageningen : Wageningen Academic Publishers (Grassland Science in Europe ) - ISBN 9781841706436 - p. 337 - 339.
The Amazing Grazing project addresses the challenges that Dutch farmers face in grazing systems with high feed supplementation and high stocking rates on available grazing area. The project consists of six interlinked components (soil, grass growth, grass supply, grass intake, supllementation and behaviour), that are arranged around two grazing and three cutting experiments, as well as three farmer consultation groups. The grazing experiment showed that fresh grass intakes of approximately 6 kg DM cow -1 d-1 are feasible in intensive grazing systems with high feed supplementation levels. Tools for grass monitoring and planning, as well as cow behaviour monitoring, are being developed to support farmer decisions.
Amazing Grazing: substantial fresh grass intake in restricted grazing systems with high stocking rates
Holshof, G. ; Zom, R.L.G. ; Schils, R.L.M. ; Pol, A. van den; Klootwijk, C.W. - \ 2018
In: Sustainable meat and milk productions from grasslands. - European Grassland Federation EGF (Grassland science in Europe ) - ISBN 9781841706436 - p. 234 - 237.
Due to larger herds on smaller grazing platforms, grazing has been decreasing in the the Netherlands. It is a challenge for farmers to achieve high fresh grass intake in modern grazing systems with high livestock densities and high supplementation levels. Two grazing systems were studied during two consecutive years: strip grazing (SG) and compartmented continuous grazing (CCG), both with 7.5 cows ha-1 on the grazing platform. Cows had daily access to the paddock for 6-8 h during daytime. During the night, supplementary feed was provided (5 - 12 kg DM cow -1 day-1; up to 8 kg DM day-1 of supplement, only maize silage was fed, above 8 kg DM a mixture of maize and grass silage was fed). Comprehensive data was collected on sward and animal performance focusing on grass intake. Both 2016 and 2017 showed an average grass intake ranging from 5.5-6.5 kg DM cow-1 day-1. The systems showed no significant difference with respect to grass intake and milk production. Each year, on averange 174% of the area of the CCG and 233% of the ares of SG was mown for silage. The results of this experiment show that grass intake can be sustantial (on average 1037 kg DM cow-1 during the grazing season) in restricted grazing systems with high stocking rates.
Amazing Grazing: N use efficiency of 60 individual dairy cows under intensive grazing
Klootwijk, C.W. ; Zom, R.L.G. ; Pol, A. van den; Middelaar, C.E. van; Holshof, G. ; Boer, I.J.M. de - \ 2018
In: Sustainable meat and milk production from grasslands. - Wageningen Academic Publishers (Grassland Science in Europe ) - ISBN 9781841706436 - p. 81 - 84.
The Dutch dairy sector aims to improve nitrogen (N) use efficiency (NUEN) of intensive dairy farms while supporting grazing. To gain insight into the NUEN of intensive dairy farms, we need insight into the NUEN at cow level. We performed a 2 x 2 factorial grazing trial with 60 Holstein Friesian cows (7.5 cows ha-1), in which we compared NUEN of individual cows under two grazing systems, i.e. compartmented continious grazing (CCG) and strip grazing (SG) and two levels of dietary rumen-degradable protein balance (OEB), i.e. low and high (a difference of 500 g OEB cow-1 day-1). Grass and supplementary intakes and faecal and milk outputs were quantified and analysed for N content, during two weeks in July and September 2016. Results showed a higher NUEN for cows in CCG (39%) compared to cows in SG (36%) in July, due to lower grass (N) intake in CCG. Low OEB showed a higher NUEN (40%) compared to high OEB (34%). Our results are key to exploring strategies to improve NUEN of farms that apply innovative grazing systems.
HEx : A heterologous expression platform for the discovery of fungal natural products
Harvey, Colin J.B. ; Tang, Mancheng ; Schlecht, Ulrich ; Horecka, Joe ; Fischer, Curt R. ; Lin, Hsiao Ching ; Li, Jian ; Naughton, Brian ; Cherry, James ; Miranda, Molly ; Li, Yong Fuga ; Chu, Angela M. ; Hennessy, James R. ; Vandova, Gergana A. ; Inglis, Diane ; Aiyar, Raeka S. ; Steinmetz, Lars M. ; Davis, Ronald W. ; Medema, Marnix H. ; Sattely, Elizabeth ; Khosla, Chaitan ; Onge, Robert P.S. ; Tang, Yi ; Hillenmeyer, Maureen E. - \ 2018
Science Advances 4 (2018)4. - ISSN 2375-2548
For decades, fungi have been a source of U.S. Food and Drug Administration-approved natural products such as penicillin, cyclosporine, and the statins. Recent breakthroughs in DNA sequencing suggest that millions of fungal species exist on Earth, with each genome encoding pathways capable of generating as many as dozens of natural products. However, the majority of encoded molecules are difficult or impossible to access because the organisms are uncultivable or the genes are transcriptionally silent. To overcome this bottleneck in natural product discovery, we developed the HEx (Heterologous EXpression) synthetic biology platform for rapid, scalable expression of fungal biosynthetic genes and their encoded metabolites in Saccharomyces cerevisiae. We applied this platform to 41 fungal biosynthetic gene clusters from diverse fungal species from around the world, 22 of which produced detectable compounds. These included novel compounds with unexpected biosynthetic origins, particularly from poorly studied species. This result establishes the HEx platform for rapid discovery of natural products from any fungal species, even those that are uncultivable, and opens the door to discovery of the next generation of natural products.
Grazing in a high-tech world : Proceedings 5th meeting EGF Working Group "Grazing" in Trondheim
Pol-van Dasselaar, A. van den; Vliegher, A. de; Hennessy, D. ; Isselstein, J. - \ 2017
Wageningen : Wageningen Livestock Research (Wageningen Livestock Research report 1079) - 29
This report presents the main outcomes of the fifth meeting of the EGF Working Group “Grazing” which was held in Trondheim, Norway on 4 September 2016. The aim of the Working Group “Grazing” is to exchange knowledge on all aspects of grazing research and to provide a forum for networking. The theme of the meeting in Trondheim was “Grazing in a high-tech world”
Organic and mineral fertilisers could improve world's food supply
Ittersum, Martin van - \ 2016
Possibilities and constraints for grazing in high output dairy systems
Hennessy, D. ; Delaby, L. ; Pol, A. van den; Shalloo, L. - \ 2015
In: Grassland and forages in high output dairy farming systems. - Wageningen : Wageningen Academic Publishers (Grassland Science in Europe ) - ISBN 9789090289618 - p. 151 - 162.
In temperate and oceanic regions, grazed grass is the lowest cost feed available for milk production. In other regions, grazed grass is less important but can contribute to the diet of livestock. Within high output systems the interaction between the animal and sward is challenging for a host of reasons, including
intake and milk production potential, substitution, grass allowance, quality, etc., which often means that grass utilisation and quality are compromised. Adaptation of grazing management and implementation of a range of grazing strategies can provide possibilities to increase the proportion of grazed grass in the diet of dairy cows in high output systems. As Europe transitions to a non-milk quota situation, increasing scale, or herd size, will probably lead to a trend towards a reduction in grazing, and may lead to a loss of the benefits of grazing. Therefore, strategies are required to increase the level of grazed grass in the diet of dairy cows on high output farms through the integration of grassland measurement and budgeting within everyday grassland management practices. There is a growing body of literature describing the benefits of grazing from an economic, environmental, animal welfare and overall social dimension. However,
there are fewer reviews highlighting the constraints and difficulties to maintaining a high level of grass utilisation and good grazing performance in high output systems. The objective of this review is to present a balanced overview of the possibilities and the constraints for grazing in dairy systems in the future.
The future of grazing : Proceedings, Third Meeting of the EGF Working Group "Grazing"
Pol, A. van den; Vliegher, A. de; Hennessy, D. ; Isselstein, J. ; Peyraud, J.L. - \ 2015
Wageningen UR Livestock Research (Livestock Research report 906) - 38 p.
grazing - future - forage - grasslands - europe - begrazing - toekomst - ruwvoer (forage) - graslanden - europa
This report presents the main results of the third meeting of the EGF Working Group “Grazing”, held in Aberystwyth, UK on 7 September 2014. The aim of the Working Group “Grazing” is to exchange knowledge on all aspects of grazing research and to provide a forum for networking.
The theme of the meeting in Aberystwyth was “The Future of Grazing”. There were five sessions:
• Welcome session / introduction
• Several forward looking views on the future of grazing in Europe
• Developments in forage production
• Current and future economics of grazing
• Closing session
The participants concluded that there certainly is a future for grazing! However, threats to grazing were also identified which need to be addressed. The EGF Working Group “Grazing” is a valuable platform for addressing these issues and exchanging knowledge on corresponding solutions
Appreciation of grassland functions by European stakeholders
Pol, A. van den; Golinski, P. ; Hennessy, D. ; Huyghe, C. ; Parente, G. ; Peyraud, J.L. - \ 2014
Fourrages (2014)218. - ISSN 0429-2766 - p. 141 - 146.
In order to promote sustainable and competitive ruminant production systems, the European Multisward project was aimed at improving farmer trust in grassland and grassland mixtures. A questionnaire on grassland functions was submitted in eight languages, in order to better understand the importance of grassland functions for all the stakeholders involved (farmers, policy decision-makers, researchers, farming advisors, students, teachers, private companies and NGOs). Over 2,000 replies were received. The 3 aspects of sustainability were classified as follows: Economic aspects > ecological aspects > social aspects, with varying results per country and type of stakeholder. Grassland functions are widely recognized and appreciated by all the players involved, emphasizing the importance of grassland in Europe.
Évaluation des fonctions des prairies par les acteurs européens
Pol-van Dasselaar, A. van den; Golinski, P. ; Hennessy, D. ; Huyghe, C. ; Parente, G. ; Peyraud, J.L. - \ 2014
Fourrages 218 (2014). - ISSN 0429-2766 - p. 141 - 146.
Pour favoriser des systèmes de production de ruminants compétitifs et durables, le projet européen Multisward avait pour objectif d'améliorer la confiance des agriculteurs dans les prairies et mélanges prairiaux. Un questionnaire en 8 langues sur les fonctions des prairies a été proposé pour mieux connaître l'importance qu'elles revêtent auprès des différents acteurs concernés. La participation active de tous les acteurs concernés par les prairies (éleveurs, décideurs politiques, chercheurs, conseillers, étudiants, enseignants, entreprises et ONG) était un des objectifs clés du projet Multisward. Le questionnaire qui leur a été diffusé les interrogeait sur les fonctions des prairies. Près de 2 000 réponses ont été obtenues (principalement de Belgique, France, Irlande, Italie, Pays-Bas et Pologne). Interrogés sur l'importance des différents aspects de la durabilité, ces acteurs ont ainsi classé les 3 dimensions de la durabilité : économie > écologie > aspects sociaux, avec des variations selon le pays et le type d'enquêté. Les différentes fonctions des prairies sont largement reconnues et appréciées par tous les groupes d'acteurs, ce qui souligne l'importance des prairies en Europe.
Deliverable D1.6. Synthesis paper on perception of European stakeholders on multifunctional grasslands
Pol-van Dasselaar, A. van den; Golinski, P. ; Hennessy, D. ; Huyghe, C. ; Parente, G. ; Peyraud, J.L. - \ 2014
MultiSward - 15 p.
Appreciation of the functions of grasslands by Irish stakeholders
Hennessy, D. ; Pol-van Dasselaar, A. van den - \ 2014
In: Proceedings of the 25th EGF General Meeting of the EGF at 50: The Future of European Grasslands. - Zurich, Switzerland : EGF - ISBN 9780992694012 - p. 810 - 812.
The European project MultiSward studied the appreciation of different functions of grasslands by European stakeholders. This paper describes the importance of grasslands for stakeholders in Ireland. Ireland currently has approximately 4.6 million ha of grassland, which is 90% of the total utilized agricultural area. Irish stakeholders consider grassland to be important for a range of functions and services including milk and meat production, forage production, animal health and welfare, perception of animal production systems and biodiversity. Functions like goat meat production, production of plant fibre, fire control and avalanche control are less appreciated. All stakeholder groups generally agreed on the importance of the functions evaluated.
Appreciation of the functions of grasslands by European stakeholders
Pol - Van Dasselaar, A. Van Den; Golinski, P. ; Hennessy, D. ; Huyghe, C. ; Parente, G. ; Peyraud, J.L. - \ 2014
In: Proceedings of the 25th EGF General Meeting of the EGF at 50: The Future of European Grasslands. - Zurich, Switzerland : EGF - ISBN 9780992694012 - p. 766 - 770.
The European project MultiSward aimed to increase the reliance of farmers on grasslands and on multi-species swards for competitive and sustainable ruminant production systems. Active participation of stakeholders was one of the key objectives of the project. The aim of the current study was to get an insight into the importance of grasslands for stakeholders in Europe. An online questionnaire on the functions of grasslands was developed in eight languages and 1959 valid responses were obtained. Belgium, France, Ireland, Italy, the Netherlands and Poland were the countries with the highest responses. All of the stakeholder groups that were identified as being important in the stakeholder analysis responded to the questionnaire. When asked about the importance of different aspects of sustainability, stakeholders, on average, valued economic aspects the highest, followed by ecological aspects and finally, social aspects. There were, however, differences between countries and stakeholder types. The results of the questionnaire show that individual functions of grasslands are highly recognized and appreciated by all relevant stakeholder groups. We conclude that the large European grassland area is considered by all stakeholders to be a valuable resource that is essential for economy, environment and people.
Appreciation of current and future functions of grassland by international stakeholders in Europe
Pol-van Dasselaar, A. van den; Golinski, P. ; Hennessy, D. ; Huyghe, C. ; Parente, G. ; Peyraud, J.L. ; Stienezen, M.W.J. - \ 2013
In: The role of grasslands in a green future: threats and perspectives in less favoured areas. Proceedings of the 17th Symposium of the European Grassland Federation, Akureyri, Iceland, 23-26 June 2013. - CAB International - ISBN 9789979881209 - p. 219 - 221.
Grasslands are the main focus of the EU-project MultiSward. Identifying stakeholder requirements and expectations with respect to multi-functionality of grasslands within Europe is part of MultiSward. A questionnaire among different stakeholders and different regions in Europe provided insight into the appreciation of the current and future functions of grasslands in Europe. The 2011 and 2012 results showed that the different functions of grasslands are highly recognized and appreciated. The large European grassland area is essential for economy, environment and people. The results of the questionnaire provided insight in the value of the different ecosystem services that grasslands provide and of different components of these services for different stakeholders in different regions. Generally, the provisioning services were considered especially valuable, followed by the regulating and supporting services, and finally the cultural services, although rankings did vary somewhat between countries and regions. We conclude that grasslands are considered by all stakeholders to be a valuable resource in Europe. Maintaining or increasing the importance of the different functions and services of grassland in Europe is a challenge for the coming years.
Appreciation of the future functions of grassland and identification of research and implementation gaps between today and future multi-functionalities by national stakeholders
Dasselaar, A. van; Golinski, P. ; Hennessy, D. ; Huyghe, C. ; Parente, G. ; Peyraud, J.L. ; Stienezen, M.W.J. - \ 2012
MultiSward - 35 p.
Innovations in grazing : proceedings 2nd meeting EGF Working Group Grazing
Pol, A. van den; Vliegher, A. de; Hennessy, D. ; Peyraud, J.L. - \ 2012
Lelystad : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 644) - 15
veehouderij - begrazing - begrazingsbeheer - innovaties - kennisoverdracht - melken - melkkoeien - melkveehouderij - beslissingsondersteunende systemen - livestock farming - grazing - grazing management - innovations - knowledge transfer - milking - dairy cows - dairy farming - decision support systems
This report presents the main results of the second meeting of the European Grassland Federation Working Group "Grazing" which was held in Lublin, Poland on 3 June 2012. The theme of the meeting was "Innovations in Grazing".
Stakeholders' reguirements and expectations with respect to multi-functionality of grasslands in Europe
Pol-van Dasselaar, A. van den; Golinski, P. ; Hennessy, D. ; Huyghe, C. ; Parente, G. ; Peyraud, J.L. ; Pinxterhuis, J.B. - \ 2012
In: Grassland - a European resource? Proceedings of the 24th General Meeting of the European Grassland Federation, Lublin, Poland, 3-7 June 2012 2012. - Poznan, Poland : Organizing Committee of the 24th General Meeting of the European Grassland Federation and Polish Grassland Society - ISBN 9788389250773 - p. 762 - 764.
The European project Multisward aims to increase reliance on grasslands and on multi-species swards for competitive and sustainable ruminant production systems. This contributes to food security and enhanced environmental goods. As part of Multisward, an inventory was made of requirements and expectations of stakeholders with respect to the multi-functionality of grasslands in EU countries. The traditional foursome of primary producer, policy maker, research and advice were identified as the most important stakeholders, followed by non-governmental organisations (NGOs) (nature, environment), education and industry. A first international stakeholder consultation revealed the appreciation of current and future functions of grasslands in Europe. In general the economic functions of grasslands, mainly feed for herbivores, were considered the most important. Stakeholders expected this to remain unchanged in future. Environmental functions of grasslands were placed second: water quality and quantity, adaptation to climate change, mitigation and biodiversity. Finally, social services were mentioned
Lean meat prediction with HGP, CGM and CSB-Image-Meater, with prediction accuracy evaluated for different proportions of gilts, boars and castrated boars in the pig population
Engel, B. ; Lambooij, E. ; Buist, W.G. ; Vereijken, P.F.G. - \ 2012
Meat Science 90 (2012)2. - ISSN 0309-1740 - p. 338 - 344.
percentage - carcasses
Prediction equations for the percentage lean meat in pig carcasses in The Netherlands were derived for the Hennessy Grading Probe 7, Capteur Gras/Maigre - Sydel and CSB-Image-Meater. Because castrated males are expected to vanish from the Dutch pig population in the near future, accuracy of prediction was evaluated for different scenarios representing a wide range of different proportions for entire males, castrated males and females in the Dutch pig population. The prediction equations for the instruments are in compliance with the EC regulations for prediction accuracy for the different scenarios. So, these equations will remain valid when castrated males are (gradually) removed from the Dutch slaughter population. Results of this study are of interest for researchers from countries or areas contemplating the use of one of the aforementioned instruments. The statistical approach for evaluation of prediction accuracy is of particular interest when changes in proportions of important subpopulations in the target population are foreseen
Research methodology of grazing
Pol, A. van den; Vliegher, A. de; Hennessy, D. ; Peyraud, J.L. ; Pinxterhuis, J.B. - \ 2011
Lelystad : Wageningen UR Livestock Research (Report / Wageningen UR Livestock Research 405) - 19
melkveehouderij - melkkoeien - begrazing - diergedrag - graslanden - graslandbeheer - groeistudies - europa - dairy farming - dairy cows - grazing - animal behaviour - grasslands - grassland management - growth studies - europe
Throughout Europe, grass is the main feed for dairy cattle. This report presents the main results of the first meeting of the European Grassland Federation (EGF) Working Group Grazing in Kiel on 29 August 2010. The theme of the meeting was "Research methodology of grazing". There were three sessions: - setting the scene; - modelling of grazing; and - field measurements.
Uitsnijden van varkenskarkassen voor het opstellen van een formule om het vleespercentage met de HGP7 (Hennessy Grading Probe), CGM (Capteur Gras/Maigre-Sydel) en de CSB (Image Meater) te schatten = Lean meat equation for the Hennessy Grading Probe (HGP7), Capteur Gras/Maigre-Sydel (CGM and CSB-Image-Meater (CSB)
Lambooij, E. ; Engel, B. ; Buist, W.G. ; Vereijken, P.F.G. - \ 2011
Lelystad : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 478) - 25
varkenshouderij - slachtdieren - slacht - mager vlees - schatting - varkensvlees - vleessamenstelling - karkassamenstelling - pig farming - meat animals - slaughter - lean - estimation - pigmeat - meat composition - carcass composition
For each of the instruments HGP7, CGM and CSB-Image-Meater a prediction formula for the percentage lean meat in a pig carcass was derived.
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