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Related Experiment Videos

Ovulation in postpartum beef cows treated with estradiol.

M Garcia-Winder1, P E Lewis, E K Inskeep

  • 1Div. Anim. Vet. Sci., West Virginia University, Morgantown 26506-6108.

Journal of Animal Science
|January 1, 1988
PubMed
Summary
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Estradiol implants effectively initiated ovarian cycles in anestrous beef cows when administered after 26 days postpartum. This treatment improved ovulation rates without altering the average days to first ovulation.

Area of Science:

  • Veterinary Science
  • Reproductive Endocrinology

Background:

  • Postpartum anestrus is a significant concern in beef cattle production, impacting reproductive efficiency.
  • Understanding the hormonal regulation of the postpartum ovarian cycle is crucial for improving fertility in beef cows.

Purpose of the Study:

  • To investigate the efficacy of estradiol implants in initiating ovarian cycles in anestrous beef cows.
  • To determine the optimal timing of estradiol administration relative to the postpartum period for inducing ovulation.

Main Methods:

  • A randomized controlled trial involving 201 anestrous beef cows over two years.
  • Estradiol-17 beta implants (24 mg) were administered for 21 days, with treatment initiated at three distinct postpartum stages (≤25, 26-39, ≥40 days).
  • Ovarian activity was monitored via progesterone levels and rectal examinations.

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Main Results:

  • Estradiol treatment significantly increased the proportion of cows that ovulated compared to controls, particularly when initiated after 26 days postpartum.
  • Circulating estradiol levels were markedly higher in treated cows (23.1 pg/ml) versus controls (3.2 pg/ml) on day 14.
  • No significant difference was observed in the average days postpartum to first ovulation among treatment groups.

Conclusions:

  • Estradiol implants are an effective tool for inducing ovulation in anestrous beef cows.
  • Administering estradiol after 26 days postpartum enhances its efficacy in initiating ovarian cycles.
  • The timing of estradiol treatment is critical for successful postpartum ovulation induction in beef cattle.