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Related Experiment Videos

Accelerated lambing using exogenous progesterone and the ram effect.

J E Wheaton1, H F Windels, L J Johnston

  • 1Department of Animal Science, University of Minnesota, St. Paul 55108.

Journal of Animal Science
|September 1, 1992
PubMed
Summary

Controlled internal drug release devices-type G (CIDR-G) effectively advanced sheep breeding seasons, inducing estrus and lambing. Reapplication of CIDR-G also stimulated a second lambing, demonstrating its utility for enhanced reproductive efficiency in ewes.

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Area of Science:

  • Reproductive biology
  • Animal science
  • Veterinary medicine

Background:

  • Advancing the breeding season in ewes is crucial for optimizing lamb production and economic viability.
  • The ram effect is a known stimulus for estrus synchronization in seasonally polyestrous ewes.
  • Controlled internal drug release devices-type G (CIDR-G) offer a method for hormonal manipulation in livestock reproduction.

Purpose of the Study:

  • To evaluate the efficacy of CIDR-G in conjunction with the ram effect for advancing the sheep breeding season.
  • To determine if CIDR-G reapplication could induce a second lambing within the same year.
  • To assess the effectiveness of CIDR-G and ram exposure for estrus induction and conception in mid-spring.

Main Methods:

  • Ewes were treated with CIDR-G for 12 days, followed by immediate introduction of isolated rams.

Related Experiment Videos

  • Estrus response and lambing rates were recorded after CIDR-G withdrawal.
  • A second CIDR-G treatment and ram exposure were implemented to assess a subsequent breeding cycle.
  • Experiments were conducted during summer and mid-spring to evaluate seasonal effectiveness.

    • Main Results:

    • In the first experiment, 100% of CIDR-G treated ewes exhibited estrus, with 93% lambing. A subsequent CIDR-G treatment resulted in 96% estrus and 82% lambing.
    • In the second experiment (mid-spring), 98% of CIDR-G treated ewes showed estrus, and 76% lambed.
    • Control groups demonstrated lower, though still significant, estrus and lambing rates.

    Conclusions:

    • CIDR-G combined with the ram effect is highly effective in advancing the sheep breeding season and inducing synchronized lambing.
    • The CIDR-G treatment protocol allows for successful induction of a second lambing in the same year.
    • This reproductive management strategy shows promise for increasing lamb production efficiency across different seasons.