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Catecholamines and equine luteal progestagens.

W A Condon, V K Ganjam, R M Kenney

    Journal of Reproduction and Fertility. Supplement
    |January 1, 1979
    PubMed
    Summary
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    Equine corpora lutea (CL) were tested for responsiveness to LH and sympathomimetic agents. Unlike bovine CL, equine CL showed no significant increase in progesterone or progestagens, indicating refractoriness to stimulation.

    Area of Science:

    • Reproductive Endocrinology
    • Comparative Physiology
    • Equine Science

    Background:

    • The corpus luteum (CL) is crucial for progesterone production in mares.
    • Previous studies suggested bovine CL responds to sympathomimetic stimulation.

    Purpose of the Study:

    • To investigate the responsiveness of equine corpora lutea to exogenous stimulation.
    • To compare the reactivity of equine CL with bovine CL.

    Main Methods:

    • Corpora lutea (CL) tissue from seven mares were collected.
    • Incubation of CL slices with ovine luteinizing hormone (LH) and sympathomimetic agents.
    • Measurement of progesterone and total progestagens in luteal tissue.

    Main Results:

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  • No significant increase in progesterone or total progestagens was observed.
  • Equine CL tissue did not respond to LH or sympathomimetic agonists/blockers.

    • Conclusions:

    • Equine corpora lutea are refractory to exogenous LH and sympathomimetic stimulation.
    • Equine CL exhibits lower responsiveness compared to bovine CL.