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16 July 2019 The use of contraceptive techniques in managed wild African lion (Panthera leo) populations to mimic open system cub recruitment
Orla K. McEvoy, Susan M. Miller, Warren Beets, Tarik Bodasing, Natalia Borrego, André Burger, Brian Courtenay, Sam Ferreira, Cathariné Hanekom, Markus Hofmeyr, Craig Packer, Dave Robertson, Ken Stratford, Rob Slotow, Dan M. Parker
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Abstract

Context. Managed wild lions (Panthera leo) are lions found in smaller (<1000 km2), fenced protected areas that hold a substantial portion of South Africa’s wild lion population. Because the natural population control mechanisms are compromised within these properties, managers must actively control population growth rates. Fecundity control is used by wildlife managers, but long-term, empirical data on the impact and consequences of such interventions in lions are lacking.

Aims. The aim of the present study was to assess the effectiveness of two methods of contraception (deslorelin implant and unilateral hysterectomy) in reducing cub recruitment of managed wild lions.

Methods. Survey data spanning 14 years from 94 managed wild lions on 19 protected areas were used to evaluate the effectiveness of deslorelin implant treatments and unilateral hysterectomies on population growth rates through mimicking open system cub recruitment.

Key results. Deslorelin implants were effective at increasing the age of first reproduction and lengthening inter-birth intervals. There was also an unexpected decrease in litter size. Behavioural side-effects were recorded in 40% of individuals: 19% pride fragmentation; 13% lack of receptiveness towards males; 8% other. The more successive deslorelin implants a lioness had, the more likely it was that weight gain was reported. Unilateral hysterectomy resulted in a decrease in litter size post-surgery, but this was not statistically significant. No behavioural or physiological side-effects were noted after unilateral hysterectomy.

Conclusions. Deslorelin treatment was more effective in reducing the reproductive output of managed wild lionesses than unilateral hysterectomy surgery. While more side-effects were associated with deslorelin implants than unilateral hysterectomies, a single deslorelin treatment is currently a good option for fecundity reduction. More research is required on unilateral hysterectomy surgery.

Implications. Neither deslorelin implants nor unilateral hysterectomies offer a ‘silver bullet’ solution for reducing rapid population growth in managed wild lions. Reproductive control should be integrated with other best-practice approaches.

© CSIRO 2019
Orla K. McEvoy, Susan M. Miller, Warren Beets, Tarik Bodasing, Natalia Borrego, André Burger, Brian Courtenay, Sam Ferreira, Cathariné Hanekom, Markus Hofmeyr, Craig Packer, Dave Robertson, Ken Stratford, Rob Slotow, and Dan M. Parker "The use of contraceptive techniques in managed wild African lion (Panthera leo) populations to mimic open system cub recruitment," Wildlife Research 46(5), 398-408, (16 July 2019). https://doi.org/10.1071/WR18079
Received: 2 May 2018; Accepted: 1 April 2019; Published: 16 July 2019
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KEYWORDS
Birth control
felid
population management
South Africa.
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