EAZA Ex-situ Programme

For zoo visitors to have the opportunity to see how wild animals look, live, and behave, zoos must ensure that truly wild animals, with all of their natural characteristics, are presented. Zoo animals are vulnerable to three very serious breeding problems inherent to small, artificial populations: inbreeding depression, loss of genetic variability, and accumulation of deleterious mutations. These problems can easily result in loss of original wild traits, and in the expression of heritable abnormalities. If what was once a pure, wild population of animals deteriorates through generations of uncontrolled breeding into inferior or partially domesticated stock, then the animals are no longer suitable for any conservation effort, and the zoos have failed to perform an important educational task. The effects of breeding captive populations of wild animals over periods of many generations have been well studied. Based on these studies and genetic theory, guidelines for breeding such small populations have been developed. Following such guidelines should sharply reduce possibilities of breeding problems and concurrently should maximize the number of generations in which the original founding diversity can be maintained. Guidelines for captive populations follow some basic principles including beginning with as many "founders" as possible (preferably at least 20-30 of animals), increase the number of individuals within the population rapidly, all individuals from the founder population should have "equal genetic representation" and inbreeding should be avoided. The application of these guidelines, and many others tailored to specific populations, results in strictly controlled breeding programmes in which nothing is left to chance. Only in this manner can healthy and truly wild populations be maintained over a period of one or two hundred years. Such strict control is entirely dependent on cooperation among zoos that hold individuals of the species, as single zoos generally do not have the facilities to maintain a population of adequate size independently. == The species in the programme ==

As of 2022, over 400 animal species are represented in the EAZA Ex-situ Programme. Gorilla (Gorilla gorilla gorilla) The Gorilla EEP is one of the most intensively managed and oldest breeding programmes in European zoos. The Gorilla EEP was started in 1987 and was run by the Frankfurt Zoological Garden, who continue to maintain the Gorilla Studbook. In the past decade, some major improvements have been achieved in the management of the EEP for the western lowland gorilla Gorilla gorilla gorilla. Neonatal mortality and hand‐rearing rates have decreased; transfers in most cases proved to be successful: almost all gorillas were integrated into their new groups and most animals introduced to a breeding group had their first offspring within two years. The results show that the current management approach is successful, and that the population is sustainable and has good genetic health. == Challenges ==

The largest problem encountered in the functioning of the EEP is undoubtedly the actual execution of breeding management recommendations: it is often difficult to develop policies applicable to an entire group of zoos (varying from 10 to well over 50 depending on the species programme) when these are spread throughout several countries with different languages and laws, and with dissimilar political and economic backgrounds. Just the incongruencies in laws can sometimes make exchange of specimens for breeding purposes by two closely situated zoos a formidable task if a border happens to lie between them. Yet successes have been achieved: the growth of the EEP has been considerable since its initiation in 1985. == Countries participating in the EEP ==

As of 2022, (insert number here) EAZA and non-EAZA/WAZA and non-WAZA countries participate in the EEP program, including: == Worldwide counterparts ==

EEP is one of the worldwide assembly of such regional breeding programs in zoos for threatened species. The North America counterpart is the Species Survival Plan, and Australian, Japanese, Indian, and Chinese zoos also have similar programs. Combined, there are now many hundred zoos worldwide involved in regional breeding programs. == See also ==