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    Physiologically Persistent Corpora lutea in Eurasian Lynx (Lynx lynx) - Longitudinal Ultrasound and Endocrine Examinations Intra-Vitam

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    Author
    Painer, J; Jewgenow, K; Dehnhard, M; Arnemo, JM; Linnell, JDC; Odden, J; Hildebrandt, TB; Goeritz, F
    Date
    2014-03-05
    Source Title
    PLoS One
    Publisher
    PUBLIC LIBRARY SCIENCE
    University of Melbourne Author/s
    Hildebrandt, Thomas
    Affiliation
    School of BioSciences
    Metadata
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    Document Type
    Journal Article
    Citations
    Painer, J., Jewgenow, K., Dehnhard, M., Arnemo, J. M., Linnell, J. D. C., Odden, J., Hildebrandt, T. B. & Goeritz, F. (2014). Physiologically Persistent Corpora lutea in Eurasian Lynx (Lynx lynx) - Longitudinal Ultrasound and Endocrine Examinations Intra-Vitam. PLOS ONE, 9 (3), https://doi.org/10.1371/journal.pone.0090469.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/257096
    DOI
    10.1371/journal.pone.0090469
    Abstract
    Felids generally follow a poly-estrous reproductive strategy. Eurasian lynx (Lynx lynx) display a different pattern of reproductive cyclicity where physiologically persistent corpora lutea (CLs) induce a mono-estrous condition which results in highly seasonal reproduction. The present study was based around a sono-morphological and endocrine study of captive Eurasian lynx, and a control-study on free-ranging lynx. We verified that CLs persist after pregnancy and pseudo-pregnancy for at least a two-year period. We could show that lynx are able to enter estrus in the following year, while CLs from the previous years persisted in structure and only temporarily reduced their function for the period of estrus onset or birth, which is unique among felids. The almost constant luteal progesterone secretion (average of 5 ng/ml serum) seems to prevent folliculogenesis outside the breeding season and has converted a poly-estrous general felid cycle into a mono-estrous cycle specific for lynx. The hormonal regulation mechanism which causes lynx to have the longest CL lifespan amongst mammals remains unclear. The described non-felid like ovarian physiology appears to be a remarkably non-plastic system. The lynx's reproductive ability to adapt to environmental and anthropogenic changes needs further investigation.

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