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Hormonal therapy for sows weaned during fall and winter.

R O Bates1, J Kelpinski, B Hines

  • 1Department of Animal Science, Michigan State University, East Lansing 48824-1225, USA. batesr@pilot.msu.edu

Journal of Animal Science
|August 18, 2000
PubMed
Summary

Hormonal therapy with P.G. 600 improved reproductive outcomes in specific sow groups, particularly enhancing estrus return in conventionally weaned sows and increasing litter size in early-weaned sows. This treatment shows potential for targeted application in swine reproduction management.

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Area of Science:

  • Veterinary Medicine
  • Animal Science
  • Reproductive Biology

Background:

  • Swine reproduction efficiency is crucial for commercial herd profitability.
  • Hormonal interventions are explored to optimize sow reproductive performance, especially during challenging weaning periods.
  • Understanding parity and lactation length effects is key to targeted reproductive strategies.

Purpose of the Study:

  • To evaluate the efficacy of P.G. 600 (containing PMSG and hCG) in improving subsequent litter size and rebreeding performance in sows weaned in fall and winter.
  • To assess the impact of hormonal therapy based on sow parity and lactation length.
  • To determine if P.G. 600 can enhance reproductive function in commercial sow herds.

Main Methods:

  • Sows from five commercial herds were categorized by parity (1, 2, 3-6) and lactation length (early ≤14 days, conventional >14 days).

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  • Sows were randomly assigned to receive P.G. 600 injection at weaning or no treatment (control).
  • Estrus detection, mating, breeding, culling, and farrowing data were systematically collected and analyzed.

    • Main Results:

    • P.G. 600 did not affect rebreeding in parity 1 or 3-6 sows.
    • Conventionally weaned parity-2 sows treated with P.G. 600 showed improved estrus return (99.0% vs 93.6%).
    • P.G. 600 increased farrowing likelihood in conventionally weaned parity 3-6 sows (84.4% vs 71.3%) and litter size in early-weaned parity 3-6 sows (12.4 vs 10.6 pigs).
    • Litter birth weight was reduced in parity-1 sows treated with P.G. 600.

    Conclusions:

    • Hormonal therapy with P.G. 600 demonstrated benefits in specific sow categories, improving reproductive function.
    • The effectiveness of P.G. 600 is dependent on sow parity and lactation length, suggesting a targeted application approach.
    • Further research may optimize P.G. 600 use for enhancing litter size and reproductive efficiency in commercial swine production.