Testosterone effects on avian basal metabolic rate and aerobic performance : facts and artefacts Buttemer, W. A., Warne, S., Bech, C. and Astheimer, L. B. 2008, Testosterone effects on avian basal metabolic rate and aerobic performance : facts and artefacts, Comparative biochemistry and physiology. Part A : molecular and integrative physiology, vol. 150, no. 2, pp. 204-210, doi: 10.1016/j.cbpa.2006.06.047. Attached Files Name Description MIMEType Size Downloads Title Testosterone effects on avian basal metabolic rate and aerobic performance : facts and artefacts Author(s) Buttemer, W. A. Warne, S. Bech, C. Astheimer, L. B. Journal name Comparative biochemistry and physiology. Part A : molecular and integrative physiology Volume number 150 Issue number 2 Start page 204 End page 210 Total pages 7 Publisher Elsevier Science Place of publication Amsterdam, The Netherlands Publication date 2008-06 ISSN 1095-6433 1531-4332 Keyword(s) basal metabolic rate cage effects muscle mass oxygen consumption rate house sparrows testosterone peak metabolic rate aerobic scope Summary We examined the effects of cage size and testosterone (T) levels on basal and peak metabolic rates (BMR and PMR, respectively) and on pectoral and leg muscle masses of male house sparrows (Passer domesticus). Birds were housed either in small birdcages or in flight aviaries for at least 2 weeks prior to the initial metabolic evaluations. They were then implanted with either empty or T-filled silastic capsules and remeasured 5–6 weeks later. Birds treated with single T implants achieved breeding levels (4–6 ng/mL) and one group given double implants reached 10 ng/mL. There was no effect of T on BMR or PMR in any group studied, but there was an effect of caging. Caged birds showed significant reductions in PMR over the course of captivity, whereas PMR in aviary-housed birds were indistinguishable from their free-living counterparts. Testosterone treatment significantly increased leg muscle mass in caged birds, but had no effect on muscle mass in aviary-housed sparrows. We conclude that testosterone has no direct effect on sparrow metabolic rate or muscle mass, but may interact with cage conditions to produce indirect changes to these variables. Language eng DOI 10.1016/j.cbpa.2006.06.047 Field of Research 060299 Ecology not elsewhere classified Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences HERDC Research category C1.1 Refereed article in a scholarly journal HERDC collection year 2008 Copyright notice ©2008, Elsevier Persistent URL http://hdl.handle.net/10536/DRO/DU:30018662 Document type: Journal Article Collections: Faculty of Science, Engineering and Built Environment School of Life and Environmental Sciences Office of the Deputy Vice-Chancellor (Research) Centre for Integrative Ecology Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Thu, 10 Sep 2009, 16:01:42 EST Thu, 10 Sep 2009, 16:09:45 EST Thu, 10 Sep 2009, 16:11:30 EST Thu, 10 Sep 2009, 16:12:04 EST Mon, 16 Nov 2009, 14:19:56 EST Tue, 17 Nov 2009, 08:52:34 EST Tue, 08 Dec 2009, 08:35:27 EST Thu, 01 Apr 2010, 13:52:28 EST Fri, 10 Jan 2014, 09:03:06 EST Mon, 16 Jun 2014, 12:39:31 EST Thu, 11 Dec 2014, 16:13:18 EST Filtered Full Citation counts:   Cited 24 times in TR Web of Science Cited 25 times in Scopus Search Google Scholar Access Statistics: 735 Abstract Views, 2 File Downloads  -  Detailed Statistics Created: Thu, 10 Sep 2009, 16:01:41 EST by Leanne Swaneveld