Laparoscopic ovariectomy in eastern grey kangaroos (<scp><i>Macropus giganteus</i></scp>) and red kangaroos (<scp><i>Macropus rufus</i></scp>)

Colgan, SA; La, Green

doi:10.1111/avj.12675

Cited by 5 publications

(10 citation statements)

References 17 publications

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“…Although gross postmortems were performed in seven of the 15 asphyxiation deaths, results were nonspecific and the diagnosis could not be confirmed. The mortality rate attributed to surgery was extremely low, with the majority of surgical mortalities euthanased due to inadvertent visceral perforation during trocar placement for laparoscopic ovariectomy …”

Section: Discussionmentioning

confidence: 99%

“…Anaesthesia was induced with 5% isoflurane in 100% oxygen via a face mask. Animals were intubated and maintained on 1%–3% isoflurane. An intravenous (IV) catheter was placed in the cephalic vein for fluid administration (10 mL/kg/min compound sodium lactate [Hartmann's; Baxter Healthcare Pty Ltd, NSW, Aust]) and to provide IV access.…”

Section: Methodsmentioning

confidence: 99%

“…Temporary chemical sterilisation of females commenced in July 2005 using 4.7 mg deslorelin implants (Suprelorin; Virbac Australia Pty Ltd, NSW, Aust) inserted subcutaneously in the interscapular area. Permanent surgical sterilisation of females commenced in April 2006 using a specifically developed laparoscopic ovariectomy technique . Open castration of males for permanent sterilisation commenced in June 2006.…”

Section: Methodsmentioning

confidence: 99%

“…Although the risks and stress associated with nonlethal population control methods may render lethal culling a more humane option, local protest and the desire for a smaller, sterilised population to remain in the 900 ha regional park that was planned as part of the development necessitated a sterilisation program. The population control methods selected were a combination of temporary chemical sterilisation using deslorelin acetate implants (Suprelorin; Virbac Australia Pty Ltd, Milperra, NSW, Aust) for females in the initial phase of the project, and permanent surgical sterilisation via open castration or laparoscopic ovariectomy in the later phase. The sterilisation methods required development of a capture protocol that enabled mobilisation, capture and anaesthesia of large numbers of animals such that hundreds of animals could be moved into holding yards to await surgery, and multiple animals could be anaesthetised and sterilised in a day.…”

mentioning

confidence: 99%

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The large‐scale capture of eastern grey kangaroos (Macropus giganteus) and red kangaroos (Osphranter rufus) and its application to a population management project

Colgan¹,

Perkins

La³

2019

Aust Veterinary J

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Objective: A large-scale capture method was developed to enable sterilisation of a macropod population in western Sydney from 2005 to 2018. Methods: Until March 2007, free ranging eastern grey kangaroos and red kangaroos were herded into purposebuilt 15 m diameter capture yards (CYs) for darting with a projectile syringe. From March 2007 onwards, animals were free-range darted in large areas without herding. Kangaroos were darted with 1.33-5.10 mg/kg tiletamine/zolazepam and 0.01-0.02 mg/kg medetomidine, AE 0.03 mg/kg acepromazine. Deaths were monitored. Population counts were performed annually. Results: There were 5825 capture events involving 3963 kangaroos. Over 85% of all captures occurred from 2005 to 2008. Of all reported deaths (n = 523), 135 were attributed to ill health. Musculoskeletal injuries incurred during capture were the main project-related cause of death (n = 116). Post capture myopathy was uncommonly diagnosed following capture (n = 19). Conclusion: The herding and capture method enabled a large number of kangaroos to be mobilised and captured with low mortality rates, and the use of CYs resulted in fewer capture-related injuries and deaths than free-range capture. The drug doses and combinations used for darting were safe and effective, and the capture technique was successfully applied to a population management project.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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The large‐scale capture of eastern grey kangaroos (Macropus giganteus) and red kangaroos (Osphranter rufus) and its application to a population management project

Colgan¹,

Perkins

La³

2019

Aust Veterinary J

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“…This paper reports on the technique and outcome of 1400 kangaroos that underwent laparoscopic ovariectomy as a population management technique over an 8-year period in western Sydney. 7 Laparoscopic ovariectomy was proposed as a terminal sterilisation technique. The animals were given a general anaesthetic, transported to a hospital, intubated, and underwent laparoscopic ovariectomy.…”

Section: Wildlife and Zoosmentioning

confidence: 99%

In this issue – March 2018

Jackson¹

2018

Aust Veterinary J

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Implementing implants: delivery efficiency, contraceptive efficacy and population outcomes in two overabundant kangaroo populations

Coulson

Wilson

2023

Wildlife Res.

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Context Overabundant native wildlife can pose serious challenges for managers. The most direct, immediate way to reduce density-dependent impacts is by culling, but lethal control often lacks public support. Fertility control offers a non-lethal management alternative. Aims We conducted two fertility-control projects on eastern grey kangaroos (Macropus giganteus), a common and widespread species in Australia. We aimed to evaluate three key components of an integrated fertility-control project, namely, delivery efficiency, contraceptive efficacy and population-level outcomes. Methods The two study sites on the urban fringe of Melbourne, Australia, were small reserves. Both had undergone an irruptive peak and subsequent crash, with negative impacts on animal health. Gresswell Forest (52 ha) is open forest habitat enclosed by a kangaroo-proof fence. Serendip Sanctuary (250 ha) is grassy woodland and retired pasture, with a boundary allowing kangaroo movement onto neighbouring properties. We captured kangaroos with a dart gun at night and treated all healthy adult females with subdermal levonorgestrel implants. Key results Delivery efficiency (catch-per-unit effort) was greater from a vehicle at Serendip Sanctuary than on foot at Gresswell Forest, with only a marginal decline over successive nights at both sites. Background fecundity was 91% at Serendip Sanctuary, but close to zero at Gresswell Forest. Treatment efficacy was high, being 86–100% infertility at Serendip Sanctuary and 96–100% at Gresswell Forest. At Serendip Sanctuary, the proportion of females treated never reached 75%, whereas only one female at Gresswell Forest remained untreated after 3 years. Population density at Serendip Sanctuary exceeded the target range 3 years after culling and fertility control. No culling occurred at Gresswell Forest, but fertility control apparently held population density at a moderate level, albeit much higher than the density target. Conclusions Future management at Serendip Sanctuary and Gresswell Forest will require a sustained fertility-control effort. Further culling may also be required to complement fertility control at Serendip Sanctuary, the larger, open site. Implications Contraceptive efficacy of levonorgestrel is high in kangaroos and implants can be delivered efficiently, but achieving control of a large, open population will be challenging.

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Laparoscopic ovariectomy in eastern grey kangaroos (Macropus giganteus) and red kangaroos (Macropus rufus)

Abstract: The procedure described is a rapid and effective method of permanent fertility control in macropods and carries a low mortality rate.

Cited by 5 publications

References 17 publications

The large‐scale capture of eastern grey kangaroos (Macropus giganteus) and red kangaroos (Osphranter rufus) and its application to a population management project

The large‐scale capture of eastern grey kangaroos (Macropus giganteus) and red kangaroos (Osphranter rufus) and its application to a population management project

In this issue – March 2018

Implementing implants: delivery efficiency, contraceptive efficacy and population outcomes in two overabundant kangaroo populations

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