Factors affecting reproduction of Snow Leopards (Panthera uncia) in captivity: age, experience, and contraception
(2026) BIOM02 20252Degree Projects in Biology
- Abstract
- As snow leopards (Panthera uncia) are vulnerable in the wild, individuals in captivity function as a backup for the wild population. However, space limitations make it difficult to keep the captive population healthy. To maintain high genetic diversity in the captive population, it is important to carefully consider breeding recommendations and the use of contraception. This study examined age-related reproductive success, the effect of contraception, and the effect of prior breeding experience. The results showed that having a litter in the last two years and female age have the highest impact on breeding success. Females that had a litter within the last two years are more likely to have a successful breeding again. This indicates that... (More)
- As snow leopards (Panthera uncia) are vulnerable in the wild, individuals in captivity function as a backup for the wild population. However, space limitations make it difficult to keep the captive population healthy. To maintain high genetic diversity in the captive population, it is important to carefully consider breeding recommendations and the use of contraception. This study examined age-related reproductive success, the effect of contraception, and the effect of prior breeding experience. The results showed that having a litter in the last two years and female age have the highest impact on breeding success. Females that had a litter within the last two years are more likely to have a successful breeding again. This indicates that snow leopards are not that sensitive to reproductive costs. Older age of females seems to have a negative effect on breeding success. Coherent with senescence, older females are less likely to be successful at breeding than younger females. Genetically important individuals should therefore have their first litter early, so the chances of success and of breeding again are higher. As space limitations lead to the need of breeding prevention, contraception is used more often. Unfortunately, not enough data about contraception was available to get significant results. Institutions with snow leopards seem to choose separation more often than hormonal contraception, as it seems that hormonal contraception is less reversible than originally thought. However, more research and more data is needed to get a good overview of all the effects of contraception. (Less)
- Popular Abstract
- Snow leopards getting cubs
Snow leopards (Panthera uncia) are big cats that live in remote mountain areas. They have unique adaptations to high mountain areas, which makes them an important species in high-altitude ecosystems. As their habitat is declining, wild snow leopards become more vulnerable. This means it is important to have a stable backup population in captivity. A population is stable if genetic diversity is above 90%; if it drops below, it can have negative effects on snow leopards. As animal welfare in zoos is improving, space limitations form a problem for housing all the newborn snow leopards. So, choices have to be made about which snow leopards are allowed to breed. This study will look at the factors that influence... (More) - Snow leopards getting cubs
Snow leopards (Panthera uncia) are big cats that live in remote mountain areas. They have unique adaptations to high mountain areas, which makes them an important species in high-altitude ecosystems. As their habitat is declining, wild snow leopards become more vulnerable. This means it is important to have a stable backup population in captivity. A population is stable if genetic diversity is above 90%; if it drops below, it can have negative effects on snow leopards. As animal welfare in zoos is improving, space limitations form a problem for housing all the newborn snow leopards. So, choices have to be made about which snow leopards are allowed to breed. This study will look at the factors that influence the ability of snow leopards to get cubs, so that well-considered recommendations can be made.
The data in this study was gathered from the snow leopard studbook, which contains information on almost all snow leopards kept in captivity. This study used data from the European dataset of 2018-2025. Information on breeding recommendations, successful breedings, ages, litter sizes, previous litters, pair types, and contraception were entered into a table. The data was analysed in RStudio. Age pyramids were created to show the number of males and females at each age in the dataset. Multiple models were run that accounted for variation between years and between individuals. The first model included all variables, and non-significant variables were removed until the final model contained only significant variables. Next to the studbook data, this study also used a survey to gain more in-depth knowledge about the management of the different institutions. This survey was summarised, and the most valuable information was retrieved.
The age pyramids showed that the most common age of individuals in the population, for both males and females, is eight years. Most snow leopards get their first cubs when they are two years old, but the age at which they are most successful is when they are five years old. This is the case for both males and females. On average snow leopards get two cubs per breeding. To prevent the snow leopards from mating, they can be given contraception. Contraception is mostly given when the snow leopards are six years old. However, as contraception is not given that often, there is not enough data to evaluate whether contraception has an effect on getting cubs. More data and research into contraception is necessary.
The model with the strongest support showed that being successful in getting cubs was significantly associated with female age and females having a litter in the two years previously. Female age had a strong negative effect, meaning that older females are less likely to breed successfully than younger females. Having a litter within the two years prior had a strong positive effect, meaning that females that had cubs within the last two years are more successful at breeding than females who did not have cubs in the last two years. The predicted probability of having cubs decreases when female age increases (Fig. 1). Furthermore, the probability of getting cubs is higher at all ages if the female had a litter in the last two years (blue line) than when she did not (red line) (Fig. 1).
The survey showed that aggressive or stress-related behaviour in snow leopards is not related to their mating behaviour. In addition, if zoos used contraception, it was often in the form of separating the male and female, instead of using hormonal contraception. This could be safer, as not a lot is known about the long-lasting effects of hormonal contraception. However, separation requires more space, and is therefore not always possible, so it would be good to gather more data on hormonal contraception as well. Not many zoos looked at the fertility of the snow leopards. However, that could be useful for determining whether pairs are unable to produce cubs due to infertility or other reasons. Therefore, fertility checks should be done more often. In conclusion, for snow leopard management, it is important to let the most important individuals for maintaining genetic diversity breed as early as possible. This strategy would increase the chances of getting cubs and of continuing to produce cubs over time. To keep important gene variants in the captive population.
Master’s Degree Project in Biology 30 credits 2026, Department of Biology, Lund University
Advisors: Bengt Hansson, Department of Biology, Lund University
Karin Amsten, Nordens Ark (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9225711
- author
- Boelhouwer, Merijne
- supervisor
- organization
- course
- BIOM02 20252
- year
- 2026
- type
- H2 - Master's Degree (Two Years)
- subject
- language
- English
- id
- 9225711
- date added to LUP
- 2026-04-23 17:28:31
- date last changed
- 2026-04-23 17:28:31
@misc{9225711,
abstract = {{As snow leopards (Panthera uncia) are vulnerable in the wild, individuals in captivity function as a backup for the wild population. However, space limitations make it difficult to keep the captive population healthy. To maintain high genetic diversity in the captive population, it is important to carefully consider breeding recommendations and the use of contraception. This study examined age-related reproductive success, the effect of contraception, and the effect of prior breeding experience. The results showed that having a litter in the last two years and female age have the highest impact on breeding success. Females that had a litter within the last two years are more likely to have a successful breeding again. This indicates that snow leopards are not that sensitive to reproductive costs. Older age of females seems to have a negative effect on breeding success. Coherent with senescence, older females are less likely to be successful at breeding than younger females. Genetically important individuals should therefore have their first litter early, so the chances of success and of breeding again are higher. As space limitations lead to the need of breeding prevention, contraception is used more often. Unfortunately, not enough data about contraception was available to get significant results. Institutions with snow leopards seem to choose separation more often than hormonal contraception, as it seems that hormonal contraception is less reversible than originally thought. However, more research and more data is needed to get a good overview of all the effects of contraception.}},
author = {{Boelhouwer, Merijne}},
language = {{eng}},
note = {{Student Paper}},
title = {{Factors affecting reproduction of Snow Leopards (Panthera uncia) in captivity: age, experience, and contraception}},
year = {{2026}},
}