| Seasonal profiles of ovarian activity in Iberian lynx (Lynx pardinus) based on urinary hormone metabolite analyses. | |
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MedLine Citation:
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PMID: 19754544 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The Iberian Lynx Ex-Situ Conservation Programme is an essential part of a co-ordinated action plan to conserve the most endangered felid species of the world. Successful captive breeding demands reliable methods for reproduction monitoring including reliable non-invasive pregnancy diagnosis. During a 3-year study, urine samples from six captive Iberian lynx females were obtained (one non-pregnant, one pseudo-pregnant and 11 pregnant cycles). Progesterone, pregnanediol and oestradiol were determined in urinary extracts and relevant urinary oestrogen metabolites were characterized by high-performance liquid chromatography (HPLC). Urinary progestins did not follow the typical pregnancy-related course of felids. In the lynx, we failed to demonstrate an urinary progestin elevation during pregnancy. In contrast, urinary oestrogens increased from 3.8 +/- 0.6 to 8.6 +/- 0.5 ng/mg creatinine (p < 0.001) during the pregnancy. A comparison of pseudo-pregnant with pregnant cycles revealed a further increase of oestrogens caused by implantation (p < 0.05). In one female, which refused to mate, no difference was estimated between oestrogens levels during the breeding and non-breeding seasons. Almost 10-fold higher oestrogen concentrations were measured in urines of females that shared enclosures with males. HPLC analysis of oestrogens in urine samples collected from Iberian lynx during the pregnancy revealed that lynx urine is composed of two polar oestrogen metabolites in addition to oestrone and minor amounts of oestradiol. Oestrone was detectable in all urinary extracts (8-12% of metabolites), whereas oestradiol was elevated only during late pregnancy (18%). Thus, seasonal luteal activity in Iberian lynx can be monitored by urinary oestrogens. The increase of urinary oestradiol during late pregnancy might indicate an oestradiol secretion by the lynx placenta. |
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Authors:
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K Jewgenow; F Göritz; A Vargas; M Dehnhard |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Reproduction in domestic animals = Zuchthygiene Volume: 44 Suppl 2 ISSN: 1439-0531 ISO Abbreviation: Reprod. Domest. Anim. Publication Date: 2009 Jul |
Date Detail:
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Created Date: 2009-09-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9015668 Medline TA: Reprod Domest Anim Country: Germany |
Other Details:
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Languages: eng Pagination: 92-7 Citation Subset: IM |
Affiliation:
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Department for Reproduction Biology, Leibniz-Institute for Zoo and Wildlife Research (IZW), Berlin, Germany. jewgenow@izw-berlin.de |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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