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Related Experiment Videos

Prostaglandin responses in dairy herd breeding programmes.

K L Macmillan1

  • 1Ruakura Animal Research Station, Private Bag, Hamilton.

New Zealand Veterinary Journal
|July 1, 1983
PubMed
Summary

Prostaglandin F2alpha (PGF) can condense dairy breeding programs and improve first insemination pregnancy rates. However, PGF should supplement, not replace, accurate estrus detection for optimal results in dairy herds.

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Area of Science:

  • Veterinary Medicine
  • Animal Reproduction
  • Dairy Science

Background:

  • Prostaglandin F2alpha (PGF) has been utilized in dairy herds to manage reproductive cycles.
  • Previous studies explored PGF efficacy in commercial dairy settings between 1974 and 1981.

Purpose of the Study:

  • To re-evaluate the effectiveness of prostaglandin F2alpha (PGF) in lactating dairy cows.
  • To assess the impact of PGF on estrus synchronization, pregnancy rates, and breeding program efficiency.
  • To determine optimal usage strategies for PGF in commercial dairy herds.

Main Methods:

  • Analysis of data from ten trials involving lactating dairy cows treated with prostaglandin F2alpha (PGF).
  • Evaluation of once or twice injections of two forms of PGF.
  • Assessment of estrus detection methods, including tail painting, and their correlation with pregnancy rates.

Main Results:

  • The interval to estrus post-PGF injection varied based on the stage of the estrous cycle at treatment, impacting pregnancy rates in set-time inseminations.
  • Routine use of accurate estrus detection aids, like tail painting, alongside PGF improved pregnancy rates by approximately 10% compared to untreated controls.
  • PGF systems did not prove effective as a standalone alternative to accurate estrus detection.

Conclusions:

  • Prostaglandin F2alpha (PGF) systems are valuable for condensing breeding programs and enhancing first insemination pregnancy rates in dairy herds.
  • Accurate estrus detection remains crucial and should be integrated with PGF protocols.
  • Reassessment of PGF usage in New Zealand dairy herds is warranted based on its fertility-enhancing effects when used appropriately.

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