Document Detail

Non-invasive monitoring of hormones: a tool to improve reproduction in captive breeding of the Eurasian lynx.
MedLine Citation:
PMID:  18638107     Owner:  NLM     Status:  MEDLINE    
The survival of many critical endangered mammal species is often depending on successful captive breeding programmes which include the future option of reintroduction to the wild. Breeding in captivity also demands the application of modern assisted reproductive techniques to ensure maximal biodiversity, but knowledge on reproductive physiology is often limited. Therefore, non-invasive monitoring of urinary and faecal hormones has become an important tool for reproductive management. To exemplify the importance of non-invasive hormone monitoring, we choose the Eurasian lynx as a model for the world's most endangered felid species, the Iberian lynx. We analysed faecal samples of pregnant and pseudo-pregnant female Eurasian lynxes during a 3-year study period. Compared to pre-mating levels faecal progesterone metabolite profiles revealed a tendency towards higher levels in pregnant and pseudo-pregnant females with no difference between both categories. Oestrogen levels raised in both pregnant and pseudo-pregnant females with a tendency to be more elevated and prolonged in pregnant females. Surprisingly both E2 and P4 metabolites were highly correlated (r(2) =0.8131, p < 0.0001) showing a postpartum increase both in pregnant and pseudo-pregnant females. The results from the Eurasian lynx revealed that the measurement of faecal progesterone metabolites led to profiles dissimilar to profiles shown in other felid species, but similar to those from faecal gestagen metabolite analysis in the Iberian lynx. To identify faecal gestagen and oestrogen metabolites a radio-metabolism study was performed. Using the progesterone immunoassay two major progesterone metabolites were detected demonstrating that the assay indeed tracks the relevant metabolites. The oestrogen assay measured authentic 17beta-oestradiol and oestrone, and their conjugates. The analysis of the faecal metabolite composition in samples from early and late pregnancy and lactation particularly revealed a distinct shift in the relation between 17beta-oestradiol and oestrone that changed in favour of oestrone. This might indicate different hormone sources during and after pregnancy (corpus luteum, placenta). We hypothesize, that placental steroid analysis in combination with other highly sophisticated analytical techniques, like liquid chromatography mass spectrometry or urinary relaxin analysis may led to analytical options to confirm pregnancy and to differentiate this from pseudo-pregnancy in lynx species.
M Dehnhard; S Naidenko; A Frank; B Braun; F Göritz; K Jewgenow
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Reproduction in domestic animals = Zuchthygiene     Volume:  43 Suppl 2     ISSN:  1439-0531     ISO Abbreviation:  Reprod. Domest. Anim.     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-07-21     Completed Date:  2008-12-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9015668     Medline TA:  Reprod Domest Anim     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  74-82     Citation Subset:  IM    
Leibniz-Institute for Zoo Biology and Wildlife Research, Berlin, Germany.
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MeSH Terms
Animals, Zoo
Breeding / methods*
Estrogens / analysis*
Feces / chemistry
Lynx / metabolism,  physiology*
Pregnancy, Animal / physiology*
Progesterone / analysis*
Reproduction / physiology*
Species Specificity
Urine / chemistry
Reg. No./Substance:
0/Estrogens; 57-83-0/Progesterone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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