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The Effect of Disease and Injury on Faecal Cortisol Metabolites, as an Indicator of Stress in Wild Hospitalised Koalas, Endangered Australian Marsupials

journal contribution
posted on 2024-01-18, 06:21 authored by Flavia SantamariaFlavia Santamaria, Rolf SchlaglothRolf Schlagloth, Ludovica Valenza, Rupert Palme, Deidre de Villiers, Joerg Henning
Loss of habitat, urbanisation, climate change and its consequences are anthropogenic pressures that may cause stress in koalas. Non-invasive monitoring of faecal cortisol metabolites (FCMs) can be utilised to evaluate the impact of stressors. The aim was to determine if the tetrahydrocorticosterone (50c) and cortisol enzyme immunoassays (EIAs) could be effective in measuring FCM values in wild, stressed koalas. This research included 146 koalas from the Australia Zoo Wildlife Hospital (AZWH) and 88 from a study conducted by Endeavour Veterinary Ecology (EVE), Queensland, Australia. Faecal samples of diseased, injured and control koalas were analysed. The effect of hospitalisation on FCM values was also investigated. Diseased and injured koalas had significantly higher FCM values than clinically healthy control animals as measured by the 50c EIA. FCM values with the cortisol EIA differed significantly between control and diseased koalas, but not between control and injured ones. Moreover, only the 50c EIA detected higher absolute values in males compared to females, and also found that females showed a more elevated response to stress manifested by injury and disease compared to males. The 50c EIA detected stress during hospitalisation better than the cortisol EIA. The cortisol EIA was also found unreliable in detecting stress in rehabilitated koalas treated with synthetic glucocorticoids as it cross-reacts with these steroids providing artificially high values.

History

Volume

10

Issue

1

Number of Pages

25

eISSN

2306-7381

ISSN

2306-7381

Publisher

MDPI AG

Publisher License

CC BY

Additional Rights

cc-by

Language

en

Peer Reviewed

  • Yes

Open Access

  • Yes

Acceptance Date

2023-01-13

Era Eligible

  • Yes

Medium

Electronic

Journal

Veterinary Sciences

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