Social stress as a source of reduced welfare in pigs Ruis, Markus

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1 Social stress as a source of reduced welfare in pigs Ruis, Markus IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below. Document Version Publisher's PDF, also known as Version of record Publication date: 2001 Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Ruis, M. A. W. (2001). Social stress as a source of reduced welfare in pigs s.n. Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons). Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Downloaded from the University of Groningen/UMCG research database (Pure): For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Download date:

2 RIJKSUNIVERSITEIT GRONINGEN SOCIAL STRESS AS A SOURCE OF REDUCED WELFARE IN PIGS Proefschrift ter verkrijging van het doctoraat in de Wiskunde en Natuurwetenschappen aan de Rijksuniversiteit Groningen op gezag van de Rector Magnificus, dr. D.F.J. Bosscher, in het openbaar te verdedigen op maandag 11 juni 2001 om uur door Markus Adrianus Wilhelmus Ruis geboren op 29 mei 1965 te Breda

3 Promotor: Referent: Beoordelingscommissie: Prof. dr. J.M. Koolhaas Dr. ir. H.J. Blokhuis Prof. dr. P. Jensen Prof. dr. B.M. Spruijt Prof. dr. A.B. Steffens ISBN

4 If you didn t care what happened to me, And I didn t care for you, We would zig zag our way through the boredom and pain, Occasionally glancing up through the rain, Wondering which of the buggers to blame And watching for pigs on the wing. Pigs on the Wing (Part One) Pink Floyd - Animals Aan Leonie, Silvio,.., en mijn moeder Ter nagedachtenis aan mijn vader

5 The research described in this thesis was carried out at the Department of Behaviour, Stress Physiology and Management, Institute for Animal Science and Health (ID-Lelystad), Lelystad, The Netherlands, and at the Department of Animal Physiology, Graduate School for Behavioral and Cognitive Neurosciences (BCN), University of Groningen, The Netherlands. The research was funded by the Dutch Organization for Scientific Research (NWO; ALW-research programme Determinants of adaptive capacity ) and the Dutch Ministry of Agriculture, Nature Management and Fisheries. The publication of this thesis was financially supported by ID-Lelystad, the University of Groningen, and the Research Institute for Animal Husbandry (Praktijkonderzoek Veehouderij (PV)), Lelystad, The Netherlands. Cover Printed by Photo by AxiPress, Lelystad, The Netherlands Universal Press, Veenendaal, The Netherlands

6 Contents Chapter 1 General introduction 7 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 The circadian rhythm of salivary cortisol in growing pigs: effects of age, gender and stress 23 Housing familiar male wildtype rats together reduces the long-term adverse behavioural and physiological effects of social defeat 39 Behavioural and physiological consequences of acute social defeat in growing gilts: effects of the social environment 55 Long-term effects of social stress on anti-viral immunity in pigs 83 Personalities in female domesticated pigs: behavioural and physiological indications 107 Implications of coping characteristics and social status for welfare and production of paired growing gilts 125 Adaptation to social isolation: acute and long-term stress responses of growing gilts with different coping characteristics 153 Chapter 9 General and summarizing discussion 175 References 187 Samenvatting 213 List of publications 227 Dankwoord 233 Curriculum vitae 239

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