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<title>UTas ePrints - Fecal testosterone concentrations may not be useful for monitoring reproductive status in male blue-tongued lizards (Tiliqua nigrolutea: Scincidae)</title>
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<meta content="Atkins, Natalia" name="eprints.creators_name" />
<meta content="Jones, Susan M." name="eprints.creators_name" />
<meta content="Edwards, Ashley" name="eprints.creators_name" />
<meta content="johnatalia@hotmail.com" name="eprints.creators_id" />
<meta content="S.M.Jones@utas.edu.au" name="eprints.creators_id" />
<meta content="Ashley.Edwards@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-01-24" name="eprints.datestamp" />
<meta content="2008-01-08 15:30:00" name="eprints.lastmod" />
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<meta content="Fecal testosterone concentrations may not be useful for monitoring reproductive status in male blue-tongued lizards (Tiliqua nigrolutea: Scincidae)" name="eprints.title" />
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<meta content="excretion, fecal, lizard, non-invasive, reproduction, steroid, testosterone " name="eprints.keywords" />
<meta content="Assessment of reproductive status in animals generally depends on monitoring hormone concentrations in plasma, but blood sampling often involves significant stress to the subject. Monitoring steroid profiles by assaying excreted steroids in urine and/or fecal samples is non-invasive, but does pose some problems.There are, however, only two published reports of the application of fecal steroid monitoring to reptiles. We compare the profile of fecal T with that for plasma T through the reproductive cycle of blotched blue-tongued lizards, and also examine the relative proportions of conjugated and free T in feces. Testosterone was detected in all samples assayed, and fecal T concentrations ranged from ~ 500 ng g-1 to ~1500 ng g-1 dry feces. Plasma hormone cycles were not reported, but the patterns of variation in fecal T concentrations appeared to show some correlation with reproductive activity. In contrast, our results suggest that there is an inverse relationship between concentrations of T in feces and in plasma of male blue-tongued skinks, with fecal T concentrations being highest during the non-breeding season, when plasma T levels are low. Our results suggest, therefore, that assay of fecal T concentrations may not be useful for assessing reproductive status in blue-tongued lizards because of the lack of correlation between T concentrations in feces and plasma. " name="eprints.abstract" />
<meta content="2002" name="eprints.date" />
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<meta content="Journal of Herpetology" name="eprints.publication" />
<meta content="36" name="eprints.volume" />
<meta content="1" name="eprints.number" />
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BROWN, J.L. 1997. Fecal steroid profiles in black-footed ferrets exposed to natural
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EDWARDS, A. 1999. Steroids and reproductive biology in the blotched blue-tongued lizard, Tiliqua nigrolutea. Unpubl. PhD thesis, University of Tasmania, Hobart, Australia.
EDWARDS, A. AND JONES, S. M. 2001. Changes in plasma testosterone, estrogen and progesterone concentrations throughout the annual reproductive cycle in male viviparous blue-tongued skinks, Tiliqua nigrolutea (Scincidae), in Tasmania. J. Herpetol. ( in press).
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Wasser, S.K., PAPAGEORGE, S., FOLEY, C., AND BROWN, J.L. 1996. Excretory fate of estradiol and progesterone in the African elephant (Loxodonta africana) and patterns of fecal steroid concentrations throughout the estrous cycle. Gen. Comp. Endocrinol. 102: 255-262.
WASSER, S.K., THOMAS, R., NAIR, GUIDRY, C., SOUTHERS, J., LUCAS, J., WILDT, D.E., AND MONFORT, S.L. 1993. Effects of dietary fibre on faecal steroid measurements in baboons (Papio cynocephalus). J. Reprod. Fert. 97: 69-574.
WILDT, D., PUKAZHENTHI, B., BROWN, J., MONFORT, S., HOWARD, J. AND ROTH, T. 1995. Spermatology for understanding, managing and conserving rare species. Reprod. Fertil. Dev. 7: 811-824.
WILSON, V.S., AND LEBLANC, G.A. 1998. Endosulfan elevates testosterone biotransformation and clearance in CD-1 mice. Toxicol. Appl. Pharmacol. 148:158-168." name="eprints.referencetext" />
<meta content="Atkins, Natalia and Jones, Susan M. and Edwards, Ashley (2002) Fecal testosterone concentrations may not be useful for monitoring reproductive status in male blue-tongued lizards (Tiliqua nigrolutea: Scincidae). Journal of Herpetology, 36 (1). pp. 106-109. ISSN 0022-1511" name="eprints.citation" />
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<meta content="Assessment of reproductive status in animals generally depends on monitoring hormone concentrations in plasma, but blood sampling often involves significant stress to the subject. Monitoring steroid profiles by assaying excreted steroids in urine and/or fecal samples is non-invasive, but does pose some problems.There are, however, only two published reports of the application of fecal steroid monitoring to reptiles. We compare the profile of fecal T with that for plasma T through the reproductive cycle of blotched blue-tongued lizards, and also examine the relative proportions of conjugated and free T in feces. Testosterone was detected in all samples assayed, and fecal T concentrations ranged from ~ 500 ng g-1 to ~1500 ng g-1 dry feces. Plasma hormone cycles were not reported, but the patterns of variation in fecal T concentrations appeared to show some correlation with reproductive activity. In contrast, our results suggest that there is an inverse relationship between concentrations of T in feces and in plasma of male blue-tongued skinks, with fecal T concentrations being highest during the non-breeding season, when plasma T levels are low. Our results suggest, therefore, that assay of fecal T concentrations may not be useful for assessing reproductive status in blue-tongued lizards because of the lack of correlation between T concentrations in feces and plasma. " name="DC.description" />
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<h1 class="ep_tm_pagetitle">Fecal testosterone concentrations may not be useful for monitoring reproductive status in male blue-tongued lizards (Tiliqua nigrolutea: Scincidae)</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Atkins, Natalia</span> and <span class="person_name">Jones, Susan M.</span> and <span class="person_name">Edwards, Ashley</span> (2002) <xhtml:em>Fecal testosterone concentrations may not be useful for monitoring reproductive status in male blue-tongued lizards (Tiliqua nigrolutea: Scincidae).</xhtml:em> Journal of Herpetology, 36 (1). pp. 106-109. ISSN 0022-1511</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_657' );" href="http://eprints.utas.edu.au/645/1/poo_paper.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_657' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_657"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/645/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/645/1/poo_paper.pdf"><span class="ep_document_citation">PDF (Author Version)</span></a> - Requires a PDF viewer<br />66Kb</td></tr></table><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Assessment of reproductive status in animals generally depends on monitoring hormone concentrations in plasma, but blood sampling often involves significant stress to the subject. Monitoring steroid profiles by assaying excreted steroids in urine and/or fecal samples is non-invasive, but does pose some problems.There are, however, only two published reports of the application of fecal steroid monitoring to reptiles. We compare the profile of fecal T with that for plasma T through the reproductive cycle of blotched blue-tongued lizards, and also examine the relative proportions of conjugated and free T in feces. Testosterone was detected in all samples assayed, and fecal T concentrations ranged from ~ 500 ng g-1 to ~1500 ng g-1 dry feces. Plasma hormone cycles were not reported, but the patterns of variation in fecal T concentrations appeared to show some correlation with reproductive activity. In contrast, our results suggest that there is an inverse relationship between concentrations of T in feces and in plasma of male blue-tongued skinks, with fecal T concentrations being highest during the non-breeding season, when plasma T levels are low. Our results suggest, therefore, that assay of fecal T concentrations may not be useful for assessing reproductive status in blue-tongued lizards because of the lack of correlation between T concentrations in feces and plasma. </p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">excretion, fecal, lizard, non-invasive, reproduction, steroid, testosterone </td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270604.html">270000 Biological Sciences > 270600 Physiology > 270604 Comparative Physiology</a><br /><a href="http://eprints.utas.edu.au/view/subjects/270603.html">270000 Biological Sciences > 270600 Physiology > 270603 Animal Physiology - Systems</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">645</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Ashley Edwards</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">24 Jan 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=645;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=645">item control page</a></p>
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