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Induced ovulation and conception in locating sows

C L Hausler, H H Hodson, D C Kuo

    Journal of Animal Science
    |May 1, 1980
    PubMed
    Summary
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    This study shows that pregnant mare serum gonadotrophin (PMSG) and human chorionic gonadotrophin (HCG) treatments can induce ovulation and conception in lactating sows as early as 15 days postpartum. This hormonal treatment allows for concurrent pregnancy and lactation, reducing the interval between farrowings.

    Area of Science:

    • Veterinary Medicine
    • Animal Reproduction
    • Endocrinology

    Background:

    • Lactating sows typically have a prolonged interval between farrowings due to anestrus.
    • Early weaning is often employed to re-establish estrus, impacting piglet welfare and production efficiency.
    • Hormonal interventions offer a potential strategy to synchronize estrus and ovulation in lactating sows.

    Purpose of the Study:

    • To evaluate the efficacy of a pregnant mare serum gonadotrophin (PMSG) and human chorionic gonadotrophin (HCG) treatment regimen for inducing ovulation and conception in lactating sows.
    • To determine the optimal timing postpartum for administering PMSG/HCG treatment to maximize pregnancy rates.
    • To assess the impact of prostaglandin F2 alpha (PGF2 alpha) pretreatment on reproductive parameters.

    Main Methods:

    Related Experiment Videos

    • Experiment 1: Lactating sows received PMSG, followed by PGF2 alpha (in some) and HCG, with timed artificial insemination.
    • Experiment 2: PMSG/HCG treatments were administered at different postpartum intervals (days 5, 10, 15, 20).
    • Experiment 3: Ovarian response to PMSG/HCG was assessed via laparotomy at 5 and 10 days postpartum.

    Main Results:

    • PMSG/HCG treatment resulted in successful pregnancies in lactating sows, with conception rates of 85% and 77% in sows allowed to complete gestation.
    • Pregnancy rates increased significantly when PMSG/HCG treatment was initiated on day 10 (2/10), day 15 (8/10), and day 20 (6/10) postpartum, compared to day 5 (0/10).
    • Ovarian response was minimal at day 5 postpartum but showed a 43% ovulation rate by day 10, suggesting improved responsiveness with delayed treatment.

    Conclusions:

    • The PMSG/HCG hormonal protocol effectively induces ovulation and conception in lactating sows, with optimal results when initiated around 15 days postpartum.
    • This approach enables concurrent lactation and gestation, potentially reducing the interval between successive farrowings and eliminating the need for early weaning.
    • PGF2 alpha pretreatment did not influence conception rates or other reproductive parameters in this study.