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Influence of environmental conditions and facility on faecal glucocorticoid concentrations in captive pygmy rabbits (Brachylagus idahoensis)

Published online by Cambridge University Press:  01 January 2023

CD Scarlata ,
BA Elias ,
JR Godwin ,
RA Powell ,
D Shepherdson ,
LA Shipley  and
JL Brown
CD Scarlata
Affiliation:
North Carolina State University, Raleigh, NC, USA Oregon Zoo, Portland, OR, USA
BA Elias
Affiliation:
Washington State University, Pullman, WA, USA
JR Godwin
Affiliation:
North Carolina State University, Raleigh, NC, USA
RA Powell
Affiliation:
North Carolina State University, Raleigh, NC, USA
D Shepherdson
Affiliation:
Oregon Zoo, Portland, OR, USA
LA Shipley
Affiliation:
Washington State University, Pullman, WA, USA
JL Brown*
Affiliation:
Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Rd, Front Royal, VA 22630, USA
*
* Contact for correspondence and requests for reprints: [email protected]
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Abstract

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The objective of this study was to determine if housing conditions, specifically pen size and soil enrichment, had an effect on faecal glucocorticoid concentrations in the endangered pygmy rabbit (Brachylagus idahoensis). The success of the captive breeding programme has been limited, so one hypothesis is that chronic stress due to sub-optimal housing conditions may be responsible for poor fecundity. Faecal glucocorticoid concentrations were assessed in 50 females housed among several pen types at two breeding facilities. The highest glucocorticoid concentrations were found in females housed in 0.37 m2 crates as compared to enclosures ranging from 0.96 to 75 m2 in size. Results also indicated that enrichment of enclosures with soil had a significant influence on adrenal activity, based on a reduction in glucocorticoid excretion for females moved from non-soil pens to those with soil. Last, a significant facility effect on glucocorticoid concentrations was observed, suggesting that factors other than housing influenced adrenal activity in these rabbits. In conclusion, based on measurements of faecal glucocorticoids, pygmy rabbits are best managed in enclosures that contain soil for digging burrows. Pen size had little effect on stress hormones, except for crates where limited space and/or absence of soil was associated with higher glucocorticoid concentrations. These results underline the importance of monitoring glucocorticoid concentrations in captive breeding programmes to identify optimal husbandry and management practices.

Keywords

animal welfarecaptive breedingenvironmental enrichmentfaecal glucocorticoidshusbandrypygmy rabbit
Type
Research Article
Information
Animal Welfare , Volume 22 , Issue 3 , August 2013 , pp. 357 - 368
Copyright
© 2013 Universities Federation for Animal Welfare

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