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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Dietary fat and reproduction in the post partum sow
Brand, H. van den; Kemp, B. - \ 2006
In: Control of Pig Reproduction VII: Seventh International Conference on Pig Reproduction, Rolduc, The Netherlands, June 12-15, 2005. - Nottingham, United Kingdom : Nottingham University Press - ISBN 190476133X - p. 177 - 189.
Lactating sows are not able to ingest sufficient energy to produce the large amount of milk they are presently capable of. Therefore, sows use a considerable amount of body reserves to maintain their milk production. The high amount of body weight loss is negatively associated with subsequent reproductive performance. Addition of fat to the diet is often used to increase energy intake during lactation. The intent of this review is to examine the effect of fat addition to the diet on subsequent reproductive performance. Fat in the diet may affect reproduction in three different ways. Firstly, increasing dietary fat increases milk fat output. This higher milk fat output limits or even nullifies the effect of a higher energy intake on body weight loss in ad libitum fed sows. It has even been demonstrated that sows fed an isocaloric fat-rich diet lost more body reserves than sows fed a carbohydrate-rich diet. Secondly, fat-rich diets increase blood levels of metabolites (non esterified fatty acids, ß-hydroxybutyrate, urea), which seems to be negatively related with reproductive performance. Thirdly, fat-rich diets depress the secretion of insulin and IGF-1, which are directly or indirectly related to reproductive hormones (LH, estradiol, progesterone) and follicle development. Based on these results, it is concluded that addition of fat to the diet of lactating sows disrupts the balance between C2 and C3 compounds, which is necessary to run the Krebs cycle in an efficient way and may negatively affect the sows¿ subsequent reproductive performance. Therefore, increasing energy intake during lactation can probably be accomplished better by adjusting other management procedures to support feed intake, such as housing temperature and water intake, which prevents overfeeding in early lactation to control body condition development.
Effects of boar stimuli on the follicular phase and on oestrous behaviour in sows
Langendijk, P. ; Soede, N.M. ; Kemp, B. - \ 2006
In: Control of Pig Reproduction VII: Seventh International Conference on Pig Reproduction, Rolduc, The Netherlands, June 12-15, 2005. - Nottingham, United Kingdom : Nottingham University Press - ISBN 190476133X - p. 219 - 230.
This review describes the role of boar stimuli in receptive behaviour, and the influence of boar stimuli during the follicular phase. Receptive behaviour (standing response) in an oestrous sow is elicited by boar stimuli, which can be olfactory, auditory, tactile, or visual. The relative importance of these stimuli is not clear. Individually, olfactory and tactile stimuli elicit a standing response in a variable percentage of sows, depending on the study, but not in all sows. Nevertheless, both tactile and olfactory stimuli seem essential to elicit a standing response. Contact with a boar is always more potent than combinations of boar stimuli. Intensive boar contact can cause habituation, reducing the responsiveness to boar stimuli. It is not clear how behavioural oestrus is 'prepared' at the brain level. Oestrogens are a key factor in the neuroendocrine maturation that precedes oestrus. The opioid peptide system is probably also involved. Once a sow is in oestrus, the neuroendocrinological events that are triggered by boar stimuli, and that induce a standing response, are not well understood. Oxytocin and prolactin are both released during a standing response, and again, the opioid peptide system seems to be involved. Boar stimuli are also important during the follicular phase. In gilts and sows, follicle development and (first) oestrus is advanced by boar exposure. Although there is very little evidence for this, an increase in LH secretion, caused by contact with a boar, is probably the explanation. With respect to this mechanism, habituation to boar stimuli might also play a role.
Tourism and spatial transformations; implications for policy and planning
Ashworth, G.J. ; Dietvorst, A.G.J. - \ 1995
Wallingford, U.K. : CAB International
The transformation of space by tourism and recreation is examined and the implications for tourism policy and planning are drawn out. A general model of transformation as a guide to intervention is presented. The first part of the book focuses on the procedures and includes case-studies from the Spanish coast, French mountains and northern Thailand. The second part considers the management of the tourism product, with examples from the Amsterdam Waterfront and holiday villages in northern Europe. Thethird part is concerned with consumers as managers of the transformation process, drawing on information from nature-based tourism, sports tourism and festival events. The final part provides a more holistic model of the planning of recreation and tourism.
Conclusion: Challenge and policy response.
Ashworth, G.J. ; Dietvorst, A.G.J. - \ 1995
In: Tourism and spatial transformations; implications for policy and planning / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 329 - 339.
In this final chapter, the editors provide a justification for the pursuit of the approach of the book as a whole by drawing together the specific studies of tourism in particular types of place. They present an integral approach to planning and management for tourism and recreation.
Tourism transformations: an introduction
Dietvorst, A.G.J. ; Ashworth, G.J. - \ 1995
In: Tourism and spatial transformations; implications for policy and planning / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 1 - 12.
In order to emphasize the dynamic character of the tourism-recreation product, an overarching concept is presented which integrates both supply and demand. The model shows the continuing transformation of the original tourism-recreation resource (either a landscape, a monument, an urban public space, a national park, or other elements) by activities and interventions by producers and consumers of many types, wittingly or not, for a variety of objectives. It embraces material practices as well as the role of image production and interpretation.
Tourist behaviour and the importance of time-space analysis
Dietvorst, A.G.J. - \ 1995
In: Tourism and spatial transformations; implications for policy and planning / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 163 - 181.
Although spatial movements are among the most typical characteristics of tourism and recreation, attention to this phenomenon is normally restricted to the analysis of static visitor numbers and their demographic or socio-economic characteristics, However, the continuing differentiation in the demand for leisure goods and services makes the development of time-space analysis necessary in order to develop a coherent tourism product. This is illustrated by a case-study from the southern part of the Netherlands and by an analysis of the time-space behaviour of visitors to the Efteling theme park in the Netherlands.
Managing deviant tourist behaviour.
Beke, B. ; Elands, B. - \ 1995
In: Tourism and spatial transformations / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 285 - 303.
Conclusion: Challenge and policy response.
Ashworth, G.J. ; Dietvorst, A.G.J. - \ 1995
In: Tourism and spatial transformations / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 329 - 341.
Tourism and spatial transformations.
Ashworth, G.J. ; Dietvorst, A.G.J. - \ 1995
Wallingford, U.K. : C.A.B. International - 341 p.
Management of recreation and tourist behaviour at different spatial levels.
Boerwinkel, H.W.J. - \ 1995
In: Tourism and spatial transformations / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 241 - 265.
Materialising the imagined: on the dynamics and assessment of tourist-recreational transformation processes.
Lengkeek, J. - \ 1995
In: Tourism and spatial transformations. Implications for policy and planning / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 17 - 37.
The third sector: a secure domain of self organisation in free time or a threatened field of social action?
Lengkeek, J. - \ 1995
In: Tourism and spatial transformations. Implications for policy and planning / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 55 - 69.
Nature-based tourism and recreation: environmental change, perception, ideology and practices.
Philipsen, J. - \ 1995
In: Tourism and spatial transformations / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 183 - 205.
Lost in the 'jungle' of Northern Thailand: the reproduction of hill tribe trekking.
Duim, V.R. van der; Binkhorst, E. - \ 1995
In: Tourism and spatial transformations. Implications for policy and planning / Ashworth, G.J., Dietvorst, A.G.J., Wallingford, UK : CAB International - p. 69 - 92.
Cultural tourism and time-space behaviour.
Dietvorst, A.G.J. - \ 1994
In: Building a new heritage: tourism, culture and identity in the new Europe / Ashworth, G.J., Larkham, P., London : Routledge - p. 69 - 89.
The concept of need in Dutch recreation planning
Beckers, Th.A.M. - \ 1985
In: The impact of tourst development on disadvantaged regions / Ashworth, G.J., Goodall, B., - p. 6 - 9.
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