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Related Experiment Videos

Controlling estrus in dairy cows - A comparative field study.

H J Voss1, W Holtz

  • 1Institut für Tierzucht und Haustiergenetik der Universität Göttingen, Albrecht-Thaer-Weg 1, 3400 Göttingen, West-Germany.

Theriogenology
|August 1, 1985
PubMed
Summary

Estrumate and Dinolytic prostaglandins, and PRID and Norgestomet progestagens effectively controlled estrus in dairy cows. While all drugs were suitable for field use, optimizing treatment and insemination regimens could improve conception rates.

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Area of Science:

  • Veterinary Medicine
  • Animal Reproduction
  • Endocrinology

Background:

  • Estrus synchronization is crucial for efficient dairy herd management.
  • Hormonal interventions using prostaglandins and progestagens are common methods.

Purpose of the Study:

  • To compare the efficacy of two prostaglandins (Estrumate, Dinolytic) and two progestagens (PRID, Norgestomet) for estrus control in dairy cows.
  • To evaluate conception rates and estrus cycle modifications following hormonal treatments.

Main Methods:

  • A field study involving 636 dairy cows across 62 farms in Lower Saxony, Germany.
  • Administration of Estrumate, Dinolytic, PRID, or Norgestomet, followed by double fixed-time insemination at 24-hour intervals.
  • Comparison with an untreated control group.

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Main Results:

  • Conception rates varied: Estrumate (51.0%), Dinolytic (46.0%), PRID (44.5%), Norgestomet (34.7%), and untreated (46.9%).
  • Post-partum treatment timing significantly impacted non-return rates and conception rates.
  • Abnormal estrus cycle lengths were observed in over 40% of treated cows compared to 12.1% in controls.

Conclusions:

  • All four hormonal treatments demonstrated suitability for estrus control in field conditions.
  • Estrumate showed the highest conception rate among the tested drugs.
  • Further optimization of treatment and insemination protocols may enhance fertilization rates.