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  • Cited by 11
  • Print publication year: 2006
  • Online publication date: August 2009

8 - Endocrinology of the giant panda and application of hormone technology to species management

Summary

INTRODUCTION

Increasing breeding success in the giant panda requires a better understanding of its complex reproductive biology. We know that the female is typically mono-oestrus during a breeding season which occurs from February to May (within and outside China). Behavioural and physiological changes associated with pro-oestrus and oestrus last one to two weeks, during which the female exhibits proceptive behaviours, such as scent marking, to advertise her sexual receptivity (Lindburg et al., 2001). During the peri-ovulatory interval, receptive behaviours (e.g. tail-up lordotic posture) climax with copulation generally occurring over a one- to three-day interval. Birthing occurs from June to October with a gestation of 85 to 185 days (Zhu et al., 2001). This unusually wide gestation span is due to the phenomenon of delayed implantation, a varied interval before the conceptus implants in the uterus and begins foetal development. The driving force behind implantation in this species is unknown. The giant panda also experiences pseudopregnancy, whereby the female exhibits behavioural, physiological and hormonal changes similar to pregnancy.

Behavioural and physiological cues associated with both pregnancy and pseudopregnancy include decreased appetite, nest-building and cradling behaviours, vulvar swelling and colouration, mammary gland enlargement and lethargy. Additionally, temporal and quantitative progesterone patterns (tracked by assessing urinary hormone by-products and progestins) are indistinguishable between pregnancy and pseudopregnancy. Therefore, no definitive test currently exists for identifying pregnant from pseudopregnant giant pandas.

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References
Bonney, R. C., Wood, D. J. and Kleiman, D. G. (1982). Endocrine correlates of behavioural oestrus in the female giant panda (Ailuropoda melanoleuca) and associated hormonal changes in the male. Journal of Reproduction and Fertility, 64, 209–15.
Bonnin, M., Canivenc, R. M. and Ribes, C. I. (1978). Plasma progesterone levels during delayed implantation in the European badger (Meles meles). Journal of Reproduction and Fertility, 52, 55–8.
Chaudhuri, M., Kleiman, D. G., Wildt, D. E.et al. (1988). Urinary steroid concentrations during natural and gonadotrophin-induced estrus and pregnancy in the giant panda (Ailuropoda melanoleuca). Journal of Reproduction and Fertility, 84, 23–8.
Cochrane, R. L. and Shackelford, R. M. (1962). Effects of exogenous estrogen alone and in combination with progesterone on pregnancy in the intact mink. Journal of Endocrinology, 25, 101–6.
Creel, S., Fox, J. E., Hardy, A.et al. (2001). Snowmobile activity and glucocorticoid stress responses in wolves and elk. Conservation Biology, 16, 809–14.
Czekala, N. M., McGeehan, L., Steinman, K. J., Li, X. and Gual-Sil, F. (2003). Endocrine monitoring and its application to the management of the giant panda. Zoo Biology, 22, 389–400.
Foresman, K. R. and Mead, R. A. (1974). Pattern of luteinizing hormone secretion during delayed implantation in the spotted skunk (Spilogale putorius latifrons). Biology of Reproduction, 11, 475–80.
Harlow, H. J., Beck, T. D. I., Walters, L. M. and Greenhouse, L. W. (1990). Seasonal serum glucose, progesterone and cortisol levels of black bears (Ursus americanus). Canadian Journal of Zoology, 68, 183–7.
Hodges, J. K., Bevan, D. J., Celma, M.et al. (1984). Aspects of the reproductive endocrinology of the female giant panda (Ailuropoda melanoleuca) in captivity with special reference to the detection of ovulation and pregnancy. Journal of Zoology London, 203, 253–67.
Howard, J. G. (1999). Assisted reproductive technologies in nondomestic carnivores. In Zoo and Wildlife Medicine, ed. Fowler, M. E. and Miller, R. E.. W. B. Saunders Co., Philadelphia, PA: pp. 449–57.
Katongole, C. B., Naftolin, F. and Short, R. V. (1971). Relationship between blood levels of luteinizing hormone and testosterone in bulls and the effects of sexual stimulation. Journal of Endocrinology, 50, 457–66.
Kleiman, D. G. (1985). Social and reproductive behavior of the giant panda (Ailuropoda melanoleuca). In Proceedings of the International Symposium of the Giant Panda, ed. Klös, H. G. and Frädrich, H.. Berlin Zoo, 10, 45–58.
Lindburg, D. G., Czekala, N. M. and Swaisgood, R. R. (2001). Hormonal and behavioral relationships during estrus in the giant panda. Zoo Biology, 20, 537–43.
Mainka, S. A., Cooper, R. M., Mao, L. and Guanlu, Z. (1990). Urinary hormones in two juvenile female giant pandas (Ailuropoda melanoleuca). Journal of Zoo and Wildlife Medicine, 21, 334–41.
McGeehan, L., Li, X., Jackintell, L.et al. (2002). Hormonal and behavioral correlates of estrus in captive giant pandas. Zoo Biology, 21, 449–66.
Mead, R. A. (1993). Embryonic diapause in vertebrates. Journal of Experimental Zoology, 266, 629–41.
Monfort, S. L., Dahl, K. D., Czekala, N. M.et al. (1989). Monitoring ovarian function and pregnancy in the giant panda (Ailuropoda melanoleuca) by evaluating urinary bioactive FSH and steroid metabolites. Journal of Reproduction and Fertility, 85, 203–12.
Monfort, S. L. (2003). Non-invasive endocrine measures of reproduction and stress in wild populations. In Reproduction and Integrated Conservation Science, ed. Holt, W. V., Pickard, A., Rodger, J. and Wildt, D. E.. Cambridge: Cambridge University Press, pp. 147–165.
Morton, D. J., Anderson, E., Foggin, C. M., Kock, M. D. and Tiran, E. P. (1995). Plasma cortisol as an indicator of stress due to capture and translocation in wildlife species. Veterinary Research, 136, 60–3.
Palumbo, P. J., Wellik, D. L., Bagley, N. A. and Nelson, R. A. (1983). Insulin and glucagon responses in the hibernating black bear. International Conference of Bear Research and Management, 5, 291–6.
Pilbeam, T. E., Concannon, P. W. and Travis, H. F. (1979). The annual reproductive cycle of the mink (Mustela vison). Journal of Animal Science, 48, 578–84.
Saginor, M. and Horton, R. (1968). Reflex release of gonadotrophin and increased plasma testosterone concentration in male rabbits during copulation. Endocrinology, 82, 627–30.
Sandell, M. (1990). The evolution of seasonal delayed implantation. Quarterly Review of Biology, 65, 23–42.
Sato, M., Tsubota, T., Komatsu, T.et al. (2001). Changes in sex steroids, gonadotrophins, prolactin and inhibin in pregnant and nonpregnant Japanese black bears (Ursus thibetanus japonicus). Biology of Reproduction, 65, 1006–13.
Schaller, G. B., Hu, J., Pan, W. and Zhu, J. (1985). The Giant Pandas of Wolong. Chicago, IL, University of Chicago Press.
Seal, U. S., Plotka, E. D., Packard, J. M. and Mech, L. D. (1979). Endocrine correlates of reproduction in the wolf: serum progesterone, estradiol and LH during the estrous cycle. Biology of Reproduction, 21, 1057–66.
Stabenfeldt, G. H., Daels, P. F., Munro, C. J.et al. (1991). An oestrogen conjugate enzyme immunoassay for monitoring pregnancy in the mare: limitations of the assay between days 40 and 70 of gestation. Journal of Reproduction and Fertility, (Suppl.), 44, 37–44.
Taleisnik, S., Caligaris, L. and Astrada, J. J. (1966). Effect of copulation on the release of gonadotrophins in male and female rats. Endocrinology, 79, 49–54.
Taussky, H. H. (1954). A micrometric determination of creatine concentration by Jaffe reaction. Journal of Biological Chemistry, 208, 853–61.
Wasser, S. K., Bevis, K., King, G. and Hanson, E. (1997). Non-invasive physiological measures of disturbance in the northern spotted owl. Conservation Biology, 11, 1019–22.
Wasser, S. K., Hunt, K. E., Brown, J. L.et al. (2000). A generalized fecal glucocorticoid assay for use in a diverse array of nondomestic mammalian and avian species. General and Comparative Endocrinology, 120, 260–75.
Wildt, D. E., Panko, W. B., Chakraborty, P. K. and Seager, S. W. J. (1979). Relationship of serum estrone, estradiol-17β and progesterone to LH, sexual behavior and time of ovulation in the bitch. Biology of Reproduction, 20, 648–58.
Zhang, G., Swaisgood, R. R. and Zhang, H. (2004). Evaluation of behavioral factors influencing reproductive success and failure in captive giant pandas. Zoo Biology, 23, 15–31.
Zheng, S., Zhao, Q., Xie, Z., Wildt, D. E. and Seal, U. S. (1997). Report of the Giant Panda Captive Management Planning Workshop. Apple Valley, MN: IUCN–World Conservation Union/SSC Conservation Breeding Specialist Group, p. 266.
Zhu, X., Lindburg, D. G., Pan, W., Forney, K. A. and Wang, D. (2001). The reproductive strategy of giant pandas (Ailuropoda melanoleuca): infant growth and development and mother–infant relationships. Journal of Zoology (London), 253, 141–55.