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Hormonal changes around bovine luteolysis.

A J Peterson, R J Fairclough, E Payne

    Prostaglandins
    |October 1, 1975
    PubMed
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    In dairy cows, progesterone declined before the estrogen rise and prostaglandin activity peaked during declining progesterone and active estrogen secretion, indicating key hormonal shifts during the estrous cycle.

    Area of Science:

    • Reproductive endocrinology
    • Dairy cattle physiology

    Background:

    • Hormonal fluctuations regulate the estrous cycle in dairy cows.
    • Understanding these dynamics is crucial for reproductive management.

    Purpose of the Study:

    • To investigate the temporal relationship between progesterone, estradiol-17beta, luteinizing hormone (LH), and prostaglandin F2alpha (PGF2alpha) around luteolysis and estrus in dairy cows.
    • To characterize the hormonal profiles preceding estrus and ovulation.

    Main Methods:

    • Radioimmunoassay was used to quantify plasma hormone levels.
    • 2-hourly blood samples were collected from three dairy cows.
    • Hormone concentrations measured included estradiol-17beta, progesterone, LH, and 13,14-dihydro-15-keto-PGF2alpha.

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    Main Results:

    • Progesterone concentrations declined prior to the pre-estrous increase in estradiol-17beta.
    • No pre-estrous peak in progesterone was observed.
    • The surge in prostaglandin activity coincided with falling progesterone levels and active estrogen secretion.

    Conclusions:

    • The findings suggest a specific sequence of hormonal events leading to estrus in dairy cows.
    • Prostaglandin activity is closely linked to the decline in progesterone and the rise in estrogen.
    • These hormonal shifts are critical indicators of impending estrus and ovulation.