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The Control of Zoo Populations with Special Reference to Primates

Published online by Cambridge University Press:  11 January 2023

A R Glatston*
Affiliation:
Rotterdam Zoo, Postbus 532, 3000 AM Rotterdam, The Netherlands

Abstract

Modern zoos are increasingly successful in maintaining and breeding exotic species. Many of the animals bred in captivity cannot be housed in their natal zoo nor in other recognized zoos in the region. These ‘surplus ‘ animals create a problem as zoos only have limited space at their disposal. The options open in this situation are to avoid the problem by preventing the animals from breeding (sterilization or contraception) or to dispose of the surplus animals (euthanasia; or transfer either to institutions not recognized by any national zoo federation or to a zoo outside the region, possibly using the services of an animal dealer). The pros and cons of all these options are evaluated in terms of practicality, welfare and ethics. In many cases, the judicious use of a combination of contraception and euthanasia would seem the most acceptable choice from an animal welfare point of view. Nevertheless, it is believed that considerably more research is needed into the methods and welfare aspects of contraception and sterilization.

Type
Research Article
Copyright
© 1998 Universities Federation for Animal Welfare

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References

Altmann, J, Hausfater, G and Altmann, S A 1988 Determinants of reproductive success in savannah baboons, Papio cynocephalus. In: Clutton-Brock, T H (ed) Reproductive Success pp 403418. University of Chicago Press: Chicago, USAGoogle Scholar
Animals (Scientific Procedures) Act 1986 Code of Practice for the Housing and Care of Animals in Designated Breeding and Supplying Establishments. HMSO: London, UKGoogle Scholar
Asa, C S and Porton, I 1991 Concerns and prospects for contraception in carnivores. In: Junge, R E (ed) Proceedings of the American Association of Zoo Veterinarians Annual Meeting, 28 September to 3 October 1991, Calgary, Canada pp 298303. AAZV: Media, Pennsylvania, USAGoogle Scholar
Asa, C S, Porton I Baker, A M and Plotka, E 1996 Contraception as a management tool for controlling surplus animals. In: Kleiman, D G, Allen, M E, Thompson, K V and Lumpkin, S (eds) Wild Animals in Captivity: Principles and Techniques pp 451460. University of Chicago Press: Chicago, USAGoogle Scholar
Aureli, F, Schino, G, Cordischi, C, Cossolini, R, Scucchi, S and van Schaik, C P 1990 Social factors affect the secondary sexual ratio in captive Japanese macaques. Folia Primatologica 55: 176180CrossRefGoogle Scholar
Bouissou, A M 1983 Androgens, aggressive behaviour and social relationships in higher mammals. Hormone Research 18: 4361CrossRefGoogle ScholarPubMed
Brouwer, K 1993 EAZA/EEP Available and wanted list: a step further towards responsible animal exchanges in European zoos. In: de Boer L, Brouwer K and Simone Smits (eds) EEP Yearbook 1992/83 pp 278281. EAZA/EEP Executive Office: Amsterdam, The NetherlandsGoogle Scholar
Chapais, B, Gauthier, C, Prud'Homme, J and Vasey, P 1997 Relatedness threshold for nepotism in Japanese macaques. Animal Behaviour 53: 10891101CrossRefGoogle Scholar
Dixon, A F 1993 Sexual and aggressive behaviour of adult male marmosets (Callitrix jacchus) castrated neonatally, prepubertally or in adulthood. Physiology and Behaviour 54: 301307CrossRefGoogle Scholar
Dixon, A F and Herbert, J 1977 Testosterone, aggressive behaviour and dominance rank in captive adult male Talapoin monkeys. Physiology and Behaviour 18: 539543CrossRefGoogle Scholar
Dunbar, B S and Schwoebel, E 1988 Fertility studies for the benefit of animals and human beings: Development of improved sterilization and contraception methods. Journal of the American Veterinary Medicine Association 193: 11651170Google Scholar
Epple, G 1978 Lack of effects of castration on scent marking, displays and aggression in a South American primate (Saguinus fuscicollis). Hormones and Behaviour 11: 139150CrossRefGoogle Scholar
Epple, G 1981 Effects of prepubertal castration on the development of scent glands, scent marking and aggression in the saddle-backed tamarin (Saguinus fuscicolis). Hormones and Behaviour 15: 5467CrossRefGoogle Scholar
Espmark, Y 1964 Rutting behaviour in reindeer, (Rangifer tarandus). Animal Behaviour 12: 159163CrossRefGoogle Scholar
European Community 1986 Council Directive 86/609/EEC on the approximation of laws, regulations and administrative provisions of Member States regarding the protection of animals used for experimental and other scientific purposes. Official Journal of the European Communities L358Google Scholar
Gerlofsma, R 1994 Review on contraceptive methods in zoo animals. Unpublished report: Utrecht University, The NetherlandsGoogle Scholar
Graham, S 1996 Issues of surplus animals. In: Kleiman, D G, Allen, M E, Thompson, K V and Lumpkin, S (eds) Wild Animals in Captivity: Principles and Techniques pp 290296. University of Chicago Press: Chicago, USAGoogle Scholar
Holst, B 1998 Ethical costs in feeding and breeding procedures. In: Rietkerk, F, Brouwer, K, Simone, Smits and Damen, M (eds) EEP Yearbook 1996/97 pp 453454. EAZA/EEP Executive Office: Amsterdam, The NetherlandsGoogle Scholar
Holst, B (in press) The ethics Of environmental enrichment. In: Proceedings Of The Third International Conference On Environmental Enrichment, 12-17 October 1997, Orlando, Florida, USAGoogle Scholar
Hosey, G R and Glatston, A R 1997 Conclusion. Applied Animal Behaviour Science 51: 323325.Google Scholar
Huntingford, F and Turner, A 1987 Aggressive Conflict. Chapman and Hall: London, UKGoogle Scholar
IUDZG/CBSG(IUCN/SSC) 1993 The World Zoo Conservation Strategy; the Role of the Zoos and Aquaria of the World in Global Conservation. Chicago Zoological Society: Chicago, USAGoogle Scholar
Jarvis, J U M 1981 Eusociality in a mammal, cooperative breeding in naked mole rat colonies. Science 212: 571573CrossRefGoogle Scholar
Kirkpatrick J F and Turner J W Jnr 1991 Reversible contraception in non-domestic animals. Journal of Zoo Wildlife Medicine 22: 392408Google Scholar
Kollias, G V, Calderwood-Mays, M B and Short, B G 1984 Diabetes mellitus and abdominal adenocarcinoma in a jaguar receiving megestrol acetate. Journal of the American Veterinary Medicine Association 185: 13831386Google Scholar
Lacy, R C 1991 Zoos and the surplus problem: an alternative solution. Zoo Biology 10: 293297CrossRefGoogle Scholar
Lindburg, D G 1991 Zoos and the ‘surplus’ problem. Zoo Biology 10: 12CrossRefGoogle Scholar
Mace, G M 1990 Birth sex ratio and infant mortality in captive western lowland gorillas. Folia Primatologica 55: 156165CrossRefGoogle Scholar
Mahi-Brown C A, Yanagimachi R, Hoffman J C and Huang T Jnr. 1985 Fertility control in the bitch by active immunization with porcine zonae pelucidae: Use of different adjuvants and patterns of estradiol and progesterone levels on estrous cycles. Biology of Reproduction 32: 761772CrossRefGoogle Scholar
Moehlman, P D 1989 Intraspecific variation in canid social systems. In: Gittleman, J L (ed) Carnivore Behaviour, Ecology and Evolution pp 143163. Chapman and Hall: London, UKCrossRefGoogle Scholar
Mundy, N, Porteur, I, Grail, C, Luton, D and Ancrenaz, M 1992 Contraception in a chimpanzee colony: experience with three techniques. Abstracts Of The XIV Congress Of The International Primatological Society, 16-21 August 1992, Strasbourg, France (p 313)Google Scholar
Munson, L 1993 Adverse effects of contraceptives in carnivores, primates and ungulates. In: Junge, R E (ed) Proceedings Of The American Association Of Zoo Veterinarians Annual Meeting, 10-15 October 1993, St Louis, Missouri pp 284288. AAZV: Media, Pennsylvania, USAGoogle Scholar
Munson, L and Mason, R J 1991 Pathological findings in the uteri of progestogen implanted exotic felids. In: Junge, R E (ed) Proceedings Of The American Association of Zoo Veterinarians Annual Meeting, 28 September to 3 October 1991, Calgary, Canada pp 311312. AAZV: Media, Pennsylvania, USAGoogle Scholar
Ogawa, H 1995 Bridging behaviour and other affiliative interactions among male Tibetan macaques. International Journal of Primatology 16: 707730CrossRefGoogle Scholar
Porton, I 1995 Results for primates from the AZA contraception database: species, methods, efficacy and reversals. In: Junge R E (ed) Proceedings Of The Joint Conference Of The American Association of Zoo Veterinarians, Wildlife Disease Association and American Association of Wildlife Veterinarians, 12-17 August 1995, East Lansing, Michigan pp 381395Google Scholar
Raphael, B L, Huntress, S L and Curro, T G 1990 Reproductive disorders associated with progestogen implants in a group of exotic felids. In: Cambre, R C (ed) Proceedings of the American Association of Zoo Veterinarians Annual Meeting, 21-26 October 1990, South Padre Island, Texas pp 282283. AAZV: Media, Pennsylvania, USAGoogle Scholar
Rietkerk, F, Brouwer, K and Smits, S 1995 EEP Yearbook 1995/96. EAZA/EEP Executive Office: Amsterdam, The NetherlandsGoogle Scholar
Sainsbury, A W 1997 The humane control of captive marmoset and tamarin populations. Animal Welfare 6: 231242CrossRefGoogle Scholar
Schmidt, C and Stevenson, M 1993 EEP Primate Taxon Advisory Group Report. Royal Zoological Society of Scotland: Edinburgh, UKGoogle Scholar
Seal, U S, Barton, R, Mather, L, Olberding, K, Plotka, E D and Gray, C W 1976 Hormonal contraception in captive female lions (Panthera leo). Journal of Zoo Animal Medicine 7: 1220CrossRefGoogle Scholar
Silk, J B 1981 Differential reproductive success and facultative adjustment of sex ratios in relation to competitive abilities among captive female bonnet macaques. Animal Behaviour 29: 11061120Google Scholar
Silk, J B, Cheyney, D and Seyfarth, R M 1996 The form and function of post conflict interactions between female baboons. Animal Behaviour 52: 259268Google Scholar
Tyler, S J 1972 The behaviour and socialisation of New Forest ponies. Animal Behaviour Monographs 5: 87196CrossRefGoogle Scholar
Van Hooff, J 1991 Dierentuinen en gedragsmusea. De Harpij 10(2): 511Google Scholar
Van Schaik, C P, Netto, W J, van Amerongen, A J J and Westland, H 1989 Social rank and sex ratio of captive long-tailed macaque females (Macaca fascicularis). American Journal of Primatology 19: 147161CrossRefGoogle ScholarPubMed
Westerveld, B and van Herk, R 1996 Euthanasie een laatste alternatief bij een verantwoord collectiebeheer. De Harpij 15(4): 1418Google Scholar
Wilson, A P and Vessey, S H 1968 Behaviour of free-ranging castrated rhesus monkeys. Folia Primatologica 9: 114CrossRefGoogle ScholarPubMed
Zhao, Q K 1996 Male-female interactions in Tibetan Macaques. Primates 37: 235–143CrossRefGoogle Scholar