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Are wild animals suited to a travelling circus life?

Published online by Cambridge University Press:  01 January 2023

G Iossa ,
CD Soulsbury  and
S Harris
G Iossa*
Affiliation:
School of Biological Sciences, Woodland Rd, University of Bristol, Bristol BS8 1UG, UK
CD Soulsbury
Affiliation:
School of Biological Sciences, Woodland Rd, University of Bristol, Bristol BS8 1UG, UK
S Harris
Affiliation:
School of Biological Sciences, Woodland Rd, University of Bristol, Bristol BS8 1UG, UK
*
* Contact for correspondence and requests for reprints: [email protected]
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Abstract

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A comprehensive synopsis of the welfare of captive, wild (ie non-domesticated) animals in travelling circuses is missing. We examined circus animal welfare and, specifically, behaviour, health, living and travelling conditions. We compared the conditions of non-domesticated animals in circuses with their counterparts kept in zoos. Data on circus animals were very scarce; where data were absent, we inferred likely welfare implications based on zoo data. Circus animals spent the majority of the day confined, about 1-9% of the day performing/training and the remaining time in exercise pens. Exercise pens were significantly smaller than minimum zoo standards for outdoor enclosures. Behavioural budgets were restricted, with circus animals spending a great amount of time performing stereotypies, especially when shackled or confined in beast wagons. A higher degree of stereotyping in circuses may be indicative of poorer welfare. Inadequate diet and housing conditions, and the effects of repeated performances, can lead to significant health problems. Circus animals travel frequently and the associated forced movement, human handling, noise, trailer movement and confinement are important stressors. Although there is no conclusive evidence as to whether animals habituate to travel, confinement in beast wagons for long timeperiods is a definite welfare concern. Circuses have a limited ability to make improvements, such as increased space, environmental enrichment and appropriate social housing. Consequently, we argue that non-domesticated animals, suitable for circus life, should exhibit low space requirements, simple social structures, low cognitive function, non-specialist ecological requirements and an ability to be transported without adverse welfare effects. None of the commonest species exhibited by circuses, such as elephants and large felids, currently meet these criteria. We conclude that the species of non-domesticated animals commonly kept in circuses appear the least suited to a circus life.

Keywords

animal welfarecircushealthhusbandryperformancestresstravel
Type
Research Article
Information
Animal Welfare , Volume 18 , Issue 2 , May 2009 , pp. 129 - 140
Copyright
© 2009 Universities Federation for Animal Welfare

References

Amboseli Elephant Research Project 2007 Circus position statement. http://www.elephanttrust.org/circus.htm (Accessed on 12 March 2008)Google Scholar
Anderson, IL 1968 Tutu poisoning in two circus elephants. New Zealand Veterinary Journal 16: 146–147CrossRefGoogle ScholarPubMed
Anonymous 2004 Opinion of the Scientific Panel on Animal Health and Welfare on a request from the Commission related to the welfare of animals during transport. EFSA Journal 44: 1–36Google Scholar
Association of Circus Proprietors of Great Britain 2001 Standards for the Care and Welfare of Circus Animals on Tour. Association of Circus Proprietors of Great Britain: UKGoogle Scholar
Banks, M, Monsalve Torraca, LS, Greenwood, AG and Taylor, DC 1999 Aujeszky's disease in captive bears. Veterinary Record 145: 362–365CrossRefGoogle ScholarPubMed
Barnard, CJ and Hurst, JL 1996 Welfare by design: the natural selection of welfare criteria. Animal Welfare 5: 405–433Google Scholar
Bashaw, MJ, Bloomsmith, MA, Marr, MJ and Maple, TL 2003 To hunt or not to hunt? A feeding enrichment with captive large felids. Zoo Biology 22: 189–198CrossRefGoogle Scholar
Birke, L 2002 Effects of browse, human visitors and noise on the behaviour of captive orangutans. Animal Welfare 11: 189–202Google Scholar
Born Free Foundation and RSPCA 2006 It's time parliament changed its Act. Born Free Foundation/RSPCA: Horsham, UKGoogle Scholar
Bowles, AE and Thompson, SJ 1996 A review of non-auditory physiological effects of noise on animals. Journal of the Acoustical Society of America 100: 2708CrossRefGoogle Scholar
Boyd, L 1986 Behavior problems of equids in zoos. Veterinary Clinics of North America-Equine Practice 2: 653–664CrossRefGoogle ScholarPubMed
British and Irish Association of Zoos and Aquariums 2005 Animal Transaction Policy. BIAZA: London, UKGoogle Scholar
Brown, JL, Olson, D, Keele, M and Freeman, EW 2004 Survey of the reproductive cyclicity status of Asian and African elephants in North America. Zoo Biology 23: 309–321CrossRefGoogle Scholar
Carlstead, K and Seidensticker, J 1991 Seasonal variation in stereotypic pacing in an American black bear, Ursus americanus. Behavioural Processes 25: 155–161CrossRefGoogle Scholar
Carlstead, K and Shepherdson, D 1994 Effects of environmental enrichment on reproduction. Zoo Biology 13: 447–458CrossRefGoogle Scholar
Carlstead, K and Shepherdson, D 2000 Alleviating stress in zoo animals with environmental enrichment. In: Moberg, GP and Mench, JA (eds) The Biology of Animal Stress pp 337–354. CABI Publishing: Oxon, UKGoogle Scholar
Cat Specialist Group 2002 Panthera tigris. 2006 IUCN Red List of Threatened Species. http://www.iucnredlist.org (Accessed 26 March 2007)Google Scholar
Chitty, J 2003 Feather plucking in psittacine birds 2. Social, environmental and behavioural considerations. In Practice 25: 550–555CrossRefGoogle Scholar
Cimino, R 1994 Cooperative elephant breeding between zoos and circuses: a realistic proposal? International Zoo News 41: 29–35Google Scholar
Clark, HW, Laughlin, DC, Bailey, JS and Brown, T 1980 Mycoplasma species and arthritis in captive elephants. Journal of Zoo Animal Medicine 11: 3–15CrossRefGoogle Scholar
Clubb, R and Mason, G 2002 A Review of the Welfare of Zoo Elephants in Europe. RSPCA: Horsham, UKGoogle Scholar
Clubb, R and Mason, G 2003 Captivity effects on wide-ranging carnivores. Nature 425: 473–474CrossRefGoogle ScholarPubMed
Clubb, R and Mason, G 2007 Natural behavioural biology as a risk factor in carnivore welfare: How analysing species differences could help zoos improve enclosures. Applied Animal Behaviour Science 102: 303–328CrossRefGoogle Scholar
Cociu, M, Wagner, G, Micu, NE and Mihaescu, G 1974 Adaptational gastro-enteritis in Siberian tigers, Panthera tigris altaica at Bucharest Zoo. International Zoo Yearbook 14: 171–174CrossRefGoogle Scholar
Cooper, JJ and Albentosa, MJ 2005 Behavioural adaptation in the domestic horse: potential role of apparently abnormal responses including stereotypic behaviour. Livestock Production Science 92: 177–182CrossRefGoogle Scholar
Cox, R 1998 The Welfare of Animals in Circuses. Wildlife Conservation Research Unit. University of Oxford: Oxford, UKGoogle Scholar
Crane, M 2007 Without the wisdom of Solomon or his ring: setting standards for exhibited animals in New South Wales. Journal of Veterinary Behavior 2: 223–229CrossRefGoogle Scholar
Dathe, HH, Kuckelkorn, B and Minnemann, D 1992 Salivary cortisol assessment for stress detection in the Asian elephant (Elephas maximus): a pilot study. Zoo Biology 11: 285–289CrossRefGoogle Scholar
Dembiec, DP, Snider, RJ and Zanella, AJ 2004 The effects of transport stress on tiger physiology and behavior. Zoo Biology 23: 335–346CrossRefGoogle Scholar
Department of Agriculture, Fisheries and Forestry 2007 Display housing. http://www.daff.gov.au/animal-plant-health/welfare/nccaw/guidelines/display/circus/display (Accessed 17 March 2008)Google Scholar
Desmond, T and Laule, G 1994 Use of positive reinforcement training in the management of species for reproduction. Zoo Biology 13: 471–477CrossRefGoogle Scholar
Evans, KE 2006 The behavioural ecology and movements of adolescent male African elephant (Loxodonta africana) in the Okavango Delta, Botswana. PhD Thesis, University of Bristol, UKGoogle Scholar
Farm Animal Welfare Council 1992 FAWC updates the five freedoms. Veterinary Record 131: 357Google Scholar
Fickel, J, Richman, LK, Montali, R, Schaftenaar, W, Göritz, F, Hildebrandt, TB and Pitra, C 2001 A variant of the endotheliotropic herpesvirus in Asian elephants (Elephas maximus) in European zoos. Veterinary Microbiology 82: 103–109CrossRefGoogle ScholarPubMed
Fleming, EH 1994 CITES and the regulation of wildlife trade for European circuses. TRAFFIC Europe: Brussels, BelgiumGoogle Scholar
Forthman, DL and Bakeman, R 1992 Environmental and social influences on enclosure use and activity patterns of captive sloth bears (Ursus ursinus). Zoo Biology 11: 405–415CrossRefGoogle Scholar
Forthman-Quick, DL 1984 An integrative approach to environmental enrichment. Zoo Biology 3: 65–77CrossRefGoogle Scholar
Friend, TH 1999 Behavior of picketed circus elephants. Applied Animal Behaviour Science 62: 73–88CrossRefGoogle Scholar
Friend, TH and Parker, ML 1999 The effect of penning versus picketing on stereotypic behavior of circus elephants. Applied Animal Behaviour Science 64: 213–225CrossRefGoogle Scholar
Galhardo, L 2005 Animals in circuses: legislation and controls in the European Union. Eurogroup for Wildlife and Laboratory Animals, unpublished reportGoogle Scholar
Garner, JP and Mason, GJ 2002 Evidence for a relationship between cage stereotypies and behavioural disinhibition in laboratory rodents. Behavioural Brain Research 136: 83–92CrossRefGoogle ScholarPubMed
Goldhorn, W and Kraft, H 1985 Die tiergerechte Haltung von Zirkustieren. Tieraerztliche Umschau 40: 809–814. [Title translation: The proper care of circus animals]Google Scholar
Goodwin, D 1999 The importance of ethology in understanding the behaviour of the horse. Equine Veterinary Journal Supplement 28: 15–19Google Scholar
Gore, M, Hutchins, M and Ray, J 2006 A review of injuries caused by elephants in captivity: an examination of the predominant factors. International Zoo Yearbook 40: 51–62CrossRefGoogle Scholar
Grandin, T 1997 Assessment of stress during handling and transport. Journal of Animal Science 75: 249–257CrossRefGoogle ScholarPubMed
Greenwood, AG 1985 Diagnosis and treatment of botulism in lions. Veterinary Record 117: 58–60CrossRefGoogle ScholarPubMed
Gruber, TM, Friend, TH, Gardner, JM, Packard, JM, Beaver, B and Bushong, D 2000 Variation in stereotypic behavior related to restraint in circus elephants. Zoo Biology 19: 209–2113.0.CO;2-7>CrossRefGoogle Scholar
Gsandtner, H, Pechlaner, H and Schwammer, HM 1997 Guidelines for the Keeping of Wild Animals in Circuses. Office of the Environmental Commissioner of the City of Vienna: Vienna, AustriaGoogle Scholar
Hartung, J 2003 Effects of transport on health of farm animals. Veterinary Research Communications 27(S1): 525–527CrossRefGoogle ScholarPubMed
Hediger, H 1955 Studies of the Psychology and Behaviour of Animals in Zoos and Circuses. Butterworths Scientific Publications: London, UKGoogle Scholar
Hemsworth, PH and Barnett, JL 2000 Human-animal interactions and animal stress. In: Moberg, GP and Mench, JA (eds) The Biology of Animal Stress pp 309–335. CABI Publishing: Oxon, UKGoogle Scholar
Hosey, GR 2000 Zoo animals and their human audiences: what is the visitor effect? Animal Welfare 9: 343–357Google Scholar
Jegstrup, IM, Vestergaard, R, Vach, W and Ritskes-Hoitinga, M 2005 Nest-building behaviour in male rats from three inbred strains: BN/HsdCpb, BDIX/Or1Ico and LEW/Mol. Animal Welfare 14: 149–156Google Scholar
Kiley-Worthington, M 1989a Animals in Circuses. RSPCA: Horsham, UKGoogle Scholar
Kiley-Worthington, M 1989b The training of circus animals. Animal Training Symposium. 26-27 September 1989, Cambridge. UFAW: Wheathampstead, Herts, UKGoogle Scholar
Kiley-Worthington, M 1990 Animals in Zoos and Circuses: Chiron's World? Little Eco-Farms Publishing: Essex, UKGoogle Scholar
King, NE and Mellen, JD 1994 The effects of early experience on adult copulatory behavior in zoo-born chimpanzees (Pan troglodytes). Zoo Biology 13: 51–59CrossRefGoogle Scholar
Knight, J 2001 Animal data jeopardized by life behind bars. Nature 412: 669CrossRefGoogle ScholarPubMed
Krawczel, PD, Friend, TH and Windom, A 2005 Stereotypic behavior of circus tigers: effects of performance. Applied Animal Behaviour Science 95: 189–198CrossRefGoogle Scholar
Kuntze, A 1989 Work-related illness: Hernia perinealis, Bursitis praepatellaris and Tyloma olecrani in female circus elephants (Elephas maximus). Erkrankungen der Zootiere 31: 185–187Google Scholar
Kurt, F 1995 The preservation of Asian elephants in human care: a comparison between the different keeping systems in South Asia and Europe. Animal Research and Development 41: 38–60Google Scholar
Kurt, F and Hartl, GB 1995 Asian elephants (Elephas maximus) in captivity: a challenge for zoo biological research. In: Gansloßer, U, Hodges, JK and Kaumanns, W (eds) Research and Captive Propagation pp 310–326. Finlander: Furth, GermanyGoogle Scholar
Kurt F and Khyne U Mar 1996 Neonate mortality in captive Asian elephant (Elephas maximus). Zeitschrift für Säugetierkunde 61: 155–164Google Scholar
Langley, RL and Hunter, JL 2001 Occupational fatalities due to animal-related events Wilderness and Environmental Medicine 12: 168–174CrossRefGoogle ScholarPubMed
Laws, N, Ganswindt, A, Heistermann, M, Harris, MJ, Harris, S and Sherwin, CM 2007 A case study: fecal corticosteroid and behavior as indicators of welfare during relocation of an Asian elephant. Journal of Applied Animal Welfare Science 10: 349–358CrossRefGoogle ScholarPubMed
Lee, A 1991 Management Guidelines for the Welfare of Zoo Animals - Giraffe. The Federation of Zoological Gardens of Great Britain and Ireland: London, UKGoogle Scholar
Leuthold, W 1977 Spatial organization and strategy of habitat utilization of elephants in Tsavo National Park, Kenia. Zeitschrift für Säugetierkunde 42: 358–379Google Scholar
Lindau, K-H 1970 Lameness in circus elephants: a result of training? Erkrankungen der Zootiere 12: 129–131Google Scholar
Lindburg, DG and Fitch-Snyder, H 1994 Use of behavior to evaluate reproductive problems in captive mammals. Zoo Biology 13: 433–445CrossRefGoogle Scholar
López-Olvera, JR, Marco, I, Montané, J and Lavín, S 2006 Transport stress in southern chamois (Rupicapra pyrenaica) and its modulation by acepromazine. Veterinary Journal 172: 347–355CrossRefGoogle ScholarPubMed
Mallapur, A and Chellam, R 2002 Environmental influences on stereotypy and the activity budget of Indian leopards (Panthera pardus) in four zoos of southern India. Zoo Biology 21: 585–595CrossRefGoogle Scholar
Mallapur, A and Choudhury, BC 2003 Behavioral abnormalities in captive nonhuman primates. Journal of Applied Animal Welfare Science 6: 275–284CrossRefGoogle ScholarPubMed
Marriner, LM and Drickamer, LC 1994 Factors influencing stereotyped behavior of primates in a zoo. Zoo Biology 13: 267–275CrossRefGoogle Scholar
Martínez, J, Segura, P, García, D, Aduriz, G, Ibabe, JC, Peris, B and Corpa, JM 2006 Septicaemia secondary to infection by Corynebacterium macginleyi in an Indian python (Python molurus). Veterinary Journal 172: 382–385CrossRefGoogle Scholar
Mason, GJ 1991a Stereotypies: a critical review. Animal Behaviour 41: 1015–1037CrossRefGoogle Scholar
Mason, GJ 1991b Stereotypies and suffering. Behavioural Processes 25: 103–115CrossRefGoogle ScholarPubMed
Mason, GJ, Cooper, J and Clarebrough, C 2001 Frustrations of fur-farmed mink. Nature 410: 35–36CrossRefGoogle ScholarPubMed
Mason, G and Rushen, J 2006 Stereotypic Animal Behaviour: Fundamentals and Applications to Welfare, 2nd Edition. CABI Publishing: Oxon, UKCrossRefGoogle Scholar
Mason, G, Clubb, R, Latham, N and Vickery, S 2007 Why and how should we use environmental enrichment to tackle stereotypic behaviour? Applied Animal Behaviour Science 102: 163–188CrossRefGoogle Scholar
Meehan, CL, Garner, JP and Mench, JA 2004 Environmental enrichment and development of cage stereotypy in orange-winged Amazon parrots (Amazona amazonica). Developmental Psychobiology 44: 209–218CrossRefGoogle ScholarPubMed
Mellen, JD 1991 Factors influencing reproductive success in small captive exotic felids (Felis spp): a multiple-regression analysis. Zoo Biology 10: 95–110CrossRefGoogle Scholar
Ministry of Agriculture and Forestry 2005 Animal Welfare (Circuses) Code of Welfare 2005. www.biosecurity.govt.nz/animal-welfare/codesGoogle Scholar
Moberg, GP 2000 Biological response to stress: implications for animal welfare. In: Moberg, GP and Mench, JA (eds) The Biology of Animal Stress pp 1–21. CABI Publishing: Oxon, UKGoogle Scholar
Montaudouin, S and Le Pape, G 2005 Comparison between 28 zoological parks: stereotypic and social behaviours of captive brown bears (Ursus arctos). Applied Animal Behaviour Science 92: 129–141CrossRefGoogle Scholar
Montes, I, McLaren, GW, Macdonald, DW and Mian, R 2004 The effect of transport stress on neutrophil activation in wild badgers (Meles meles). Animal Welfare 13: 355–359Google Scholar
Morgan, KN and Tromborg, CT 2007 Sources of stress in captivity. Applied Animal Behaviour Science 102: 262–302CrossRefGoogle Scholar
Müller, P 2004 30 Jahre Internationales Tigerzuchtbuch in Leipzig. Zoologische Garten 74: 65–76. [Title translation: Thirty years International Tiger Studbook in Leipzig]Google Scholar
Nevill, CH and Friend, TH 2003 The behavior of circus tigers during transport. Applied Animal Behaviour Science 82: 329–337CrossRefGoogle Scholar
Nevill, CH and Friend, TH 2006 A preliminary study on the effects of limited access to an exercise pen on stereotypic pacing in circus tigers. Applied Animal Behaviour Science 101: 355–361CrossRefGoogle Scholar
Nevill, CH, Friend, TH and Toscano, MJ 2004 Survey of transport environments of circus tigers (Panthera tigris). Journal of Zoo and Wildlife Medicine 35: 164–174CrossRefGoogle ScholarPubMed
Nyhus, PJ, Tilson, RL and Tomlinson, JL 2003 Dangerous animals in captivity: ex situ tiger conflict and implications for private ownership of exotic animals. Zoo Biology 22: 573–586CrossRefGoogle Scholar
Owen, MA, Swaisgood, RR, Czekala, NM, Steinman, K and Lindburg, DG 2004 Monitoring stress in captive giant pandas (Ailuropoda melanoleuca): behavioral and hormonal responses to ambient noise. Zoo Biology 23: 147–164CrossRefGoogle Scholar
Price, EO 1984 Behavioral aspects of animal domestication. Quarterly Review of Biology 59: 1–32CrossRefGoogle Scholar
Price, EO 1999 Behavioral development in animals undergoing domestication. Applied Animal Behaviour Science 65: 245–271CrossRefGoogle Scholar
Price, EE and Stoinski, TS 2007 Group size: determinants in the wild and implications for the captive housing of wild mammals in zoos. Applied Animal Behaviour Science 103: 255–264CrossRefGoogle Scholar
Pullin, AS and Stewart, GB 2006 Guidelines for systematic review in conservation and environmental management. Conservation Biology 20: 1647–1656CrossRefGoogle ScholarPubMed
Radford, M 2007 Wild Animals in Travelling Circuses: the Report of the Chairman of the Circus Working Group. http://www.defra.gov.uk/animalh/welfare/pdf/circus-report.pdf (Accessed on 12 March 2008)Google Scholar
Rees, PA 2003 Asian elephants in zoos face global extinction: should zoos accept the inevitable? Oryx 37: 20–22CrossRefGoogle Scholar
Reitschel, W 2002 Haltung von Elefanten im Zoo und Zirkus. Deutsche Tieräztliche Wochenschrift 109: 123–126. [Title translation: Keeping of elephants in zoo and circus]Google Scholar
Sambrook, TD and Buchanan-Smith, HM 1997 Control and complexity in novel object enrichment. Animal Welfare 6: 207–216Google Scholar
Schaller, VK 1983 A case of rhododendron poisoning in circus elephants. Kleintier-Praxis 28: 53–56Google Scholar
Schmid, J 1995 Keeping circus elephants temporarily in paddocks: the effects on their behaviour Animal Welfare 4: 87–101Google Scholar
Schmid, J 1998 Status and reproductive capacity of the Asian elephant in zoos and circuses in Europe. International Zoo News 45/6: 341–351Google Scholar
Schmidt, M 1986 Elephants (Proboscidea). In: Fowler, ME (ed) Zoo and Wild Animal Medicine pp 883–923. WB Saunders Company: Philadelphia, PA, USAGoogle Scholar
Schmid, R, Doherr, MG and Steiger, A 2006 The influence of the breeding method on the behaviour of adult African grey parrots (Psittacus erithacus). Applied Animal Behaviour Science 98: 293–307CrossRefGoogle Scholar
Schrøder-Petersen, DL and Simonsen, HB 2001 Tail biting in pigs. Veterinary Journal 162: 196–210CrossRefGoogle ScholarPubMed
Schulze, W 1986 Zur Haltung von Elefanten im Zirkus mit Beruecksichtigung ihrer Minimalbeduerfnisse. Praktische Tierarzt 67: 809–811. [Title translation: On the keeping of elephants in a circus with regard to their minimal requirements]Google Scholar
Schuppli, CA and Fraser, D 2000 A framework for assessing the suitability of different species as companion animals. Animal Welfare 9: 359–372Google Scholar
Siemoneit-Barum, G 1995 Zur Praxis von Dressur und Tierhaltung im Zirkus. Deutsche Tieräztliche Wochenschrift 95: 77–79. [Title translation: The practice of training and animal husbandry in the circus]Google Scholar
Stoskopf, MK 1983 The physiological effects of psychological stress. Zoo Biology 2: 179–190CrossRefGoogle Scholar
Sukumar, R 1992 The Asian Elephant: Ecology and Management. Cambridge University Press: Cambridge, UKGoogle Scholar
Sukumar, R 2003 The Living Elephants - Evolutionary Ecology, Behavior, and Conservation. Oxford University Press: New York, NY, USAGoogle Scholar
Taylor, VJ and Poole, TB 1998 Captive breeding and infant mortality in Asian elephants: a comparison between twenty western zoos and three eastern elephant centers. Zoo Biology 17: 311–3323.0.CO;2-C>CrossRefGoogle Scholar
Terio, KA, Marker, L and Munson, L 2004 Evidence for chronic stress in captive but not free-ranging cheetahs (Acinonyx jubatus) based on adrenal morphology and function. Journal of Wildlife Diseases 40: 259–266CrossRefGoogle Scholar
Thompson, VD 1989 Behavioral response of 12 ungulate species in captivity to the presence of humans. Zoo Biology 8: 275–297CrossRefGoogle Scholar
Toscano, MJ, Friend, TH and Nevill, CH 2001 Environmental conditions and body temperature of circus elephants transported during relatively high and low temperature conditions. Journal of Elephant Managers Association 12: 115–149Google Scholar
Trunkfield, HR and Broom, DM 1990 The welfare of calves during handling and transport. Applied Animal Behaviour Science 28: 135–152CrossRefGoogle Scholar
Vaarst, M, Hindhede, J and Enevoldsen, C 1998 Sole disorders in conventionally managed and organic dairy herds using different housing systems. Journal of Dairy Research 6: 175–186CrossRefGoogle Scholar
Waran, NK and Cuddeford, D 1995 Effects of loading and transport on the heart rate and behaviour of horses. Applied Animal Behaviour Science 43: 71–81CrossRefGoogle Scholar
Waran, N, Leadon, D and Friend, T 2002 The effects of transportation on the welfare of horses. In: Waran, N (ed) The Welfare of Horses pp 125–150. Kluwer Academic Publishers: Dordrecht, The NetherlandsGoogle Scholar
WAZA 2006 Understanding Animals and Protecting them - About the World Zoo and Aquarium Conservation Strategy. World Association of Zoos and Aquariums: Bern, SwitzerlandGoogle Scholar
Weller, SH and Bennett, CL 2001 Twenty-four hour activity budget and patterns of behavior in captive ocelots (Leopardus pardalis). Applied Animal Behaviour Science 71: 67–79CrossRefGoogle ScholarPubMed
West, G 2001 Occurrence and treatment of nail/foot abscesses nail cracks, and sole abscesses in captive elephants. In: Csuti, B, Sargent, EL and Bechert, US (eds) The Elephant's Foot pp 93–97. Iowa State University Press: Ames, Iowa, USAGoogle Scholar
Wielebnowski, NC, Fletchall, N, Carlstead, K, Busso, JM and Brown, JL 2002 Noninvasive assessment of adrenal activity associated with husbandry and behavioral factors in the North American clouded leopard population. Zoo Biology 21: 77–98CrossRefGoogle Scholar
Wiesner, H 1986 Probleme bei der Haltung von Zirkustieren. Tieraerztliche Umschau 41: 753–755. [Title translation: Problems of circus animals]Google Scholar
Williams, JL and Friend, TH 2003 Behavior of circus elephants during transport. Journal of Elephant Managers Association 14: 8–11Google Scholar
Würbel, H 2001 Ideal homes? Housing effects on rodent brain and behaviour. Trends Neuroscience 24: 207–211CrossRefGoogle ScholarPubMed
Young, RJ 2003 Environmental Enrichment for Captive Animals. UFAW Animal Welfare Series, Blackwell Science Ltd: Oxon, UKCrossRefGoogle Scholar
Zimmermann, A, Hatchwell, M, Dickie, L and West, C 2007 Zoos in the 21st Century. Catalysts for Conservation? Cambridge University Press: Cambridge, UKGoogle Scholar