A reproductive management program for an urban population of eastern grey kangaroos (Macropus giganteus)

Tribe, Andrew, Hanger, Jon, McDonald, Ian J., Loader, Jo, Nottidge, Ben J., McKee, Jeff J. and Philips, Clive J.C. (2014) A reproductive management program for an urban population of eastern grey kangaroos (Macropus giganteus). Animals, 4 3: 562-582. doi:10.3390/ani4030562


Author Tribe, Andrew
Hanger, Jon
McDonald, Ian J.
Loader, Jo
Nottidge, Ben J.
McKee, Jeff J.
Philips, Clive J.C.
Title A reproductive management program for an urban population of eastern grey kangaroos (Macropus giganteus)
Journal name Animals   Check publisher's open access policy
ISSN 2076-2615
Publication date 2014-09-15
Year available 2014
Sub-type Article (original research)
DOI 10.3390/ani4030562
Open Access Status DOI
Volume 4
Issue 3
Start page 562
End page 582
Total pages 21
Place of publication Basel, Switzerland
Publisher M D P I AG
Collection year 2015
Language eng
Formatted abstract
Traditionally, culling has been the expedient, most common, and in many cases, the only tool used to control free-ranging kangaroo populations. We applied a reproductive control program to a population of eastern grey kangaroos confined to a golf course in South East Queensland. The program aimed to reduce fecundity sufficiently for the population to decrease over time so that overgrazing of the fairways and the frequency of human–animal conflict situations were minimised. In 2003, 92% of the female kangaroos above 5 kg bodyweight were implanted with the GnRH agonist deslorelin after darting with a dissociative anaesthetic. In 2007, 86% of the females above 5 kg were implanted with deslorelin and also 87% of the males above 5 kg were sterilised by either orchidectomy or vasectomy. In 2005, 2008 and 2009, the population was censused to assess the effect of each treatment. The 2003 deslorelin program resulted in effective zero population growth for approximately 2.5 years. The combined deslorelin–surgery program in 2007 reduced the birth rate from 0.3 to 0.06%/year for 16 months, resulting in a 27% population reduction by November 2009. The results were consistent with implants conferring contraception to 100% of implanted females for at least 12 months. The iatrogenic mortality rates for each program were 10.5% and 4.9%, respectively, with 50% of all mortalities due to darting-related injuries, exertional myopathy/hyperthermia or recovery misadventure. The short term sexual and agonistic behaviour of the males was assessed for the 2007 program: no significant changes were seen in adult males given the vasectomy procedure, while sexual behaviours’ were decreased in adult males given the orchidectomy procedure. It is concluded that female reproduction was effectively controlled by implantation with deslorrelin and male reproductive behaviour was reduced by orchidectomy, which together achieved population control
Keyword Behaviour
Deslorelin
Orchidectomy
Vasectomy
Welfare
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2015 Collection
School of Veterinary Science Publications
 
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Created: Mon, 01 Dec 2014, 14:03:26 EST by Annette Winter on behalf of School of Agriculture and Food Sciences