Abstract
Practical and reliable methods for assessing reproductive status are essential for any work designed to enhance fertility in captive endangered species. This paper described recent advances in the development and application of such methods and their implications for the management of captive breeding. Since non-invasive procedures are necessary when working with animals that are easily stressed, urinary hormone analysis provides the most feasible approach to long term studies on most endangered species. Simplified hormone assay methods have been developed and applied to the detection of ovulation and pregnancy in a variety of animals, including primates, the Giant Panda and ungulates. The possibility now exists for extending the application of these methods to studies in the field. Finally, the ability to monitor reproductive status in endangered animals provides the basis for future attempts to accelerate captive breeding by artificial means.
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