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Studies of pituitary function in lactating ewes.

B J Restall, R D Kearins, B G Starr

    Journal of Reproduction and Fertility
    |March 1, 1977
    PubMed
    Summary
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    Hormone treatments affect luteinizing hormone (LH) release in lactating ewes. Estradiol benzoate decreased LH release over time, while testosterone propionate increased it, impacting ovulation rates.

    Area of Science:

    • Reproductive endocrinology
    • Animal physiology

    Background:

    • Lactation influences the reproductive cycle in ewes.
    • Understanding hormonal regulation of luteinizing hormone (LH) is crucial for reproductive management.

    Purpose of the Study:

    • To investigate the effects of estradiol benzoate (OB) and testosterone propionate (TP) on LH release and ovulation in lactating ewes.
    • To evaluate the impact of gonadotropin-releasing hormone (Gn-RH) dosage and timing on LH release and ovulation during the postpartum period.

    Main Methods:

    • Experiment 1: Lactating ewes received OB, TP, or oil (control) on days 5, 10, or 20 postpartum. Peripheral plasma LH levels and ovulation were monitored.
    • Experiment 2: Ewes received single or multiple doses of Gn-RH on days 12 or 25 postpartum. LH release and ovulation were assessed over an extended period.

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    Main Results:

    • OB treatment decreased LH release and incidence of ovulation between days 5 and 20 postpartum.
    • TP treatment increased LH release and ovulation incidence.
    • Gn-RH administration stimulated LH release in all ewes, with greater amounts observed with multiple injections and later treatment (Day 25).
    • Ovulation incidence was higher following Gn-RH treatment on Day 25, and multiple Gn-RH injections potentially reduced abnormal corpora lutea.

    Conclusions:

    • Steroid hormones differentially regulate LH release and ovulation in lactating ewes.
    • Gn-RH is effective in inducing LH release and ovulation postpartum, with timing and dosage influencing the response.
    • Gn-RH treatment, particularly multiple injections, may improve reproductive outcomes by reducing abnormal corpora lutea.