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Related Experiment Videos

A field study on estrus detection in lactating beef cattle.

C Ducrot1, Y T Gröhn, F Bugnard

  • 1Centre d'écopathologie animale, Villeurbanne, France. ducrot@clermont.inra.fr

Veterinary Research
|March 19, 1999
PubMed
Summary

Effective estrus detection in beef cows is crucial for reproductive efficiency. Many French farmers struggle with heat detection protocols, leading to delayed insemination and suboptimal outcomes, highlighting a need for improved practices.

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Area of Science:

  • Animal Science
  • Reproductive Biology
  • Dairy Management

Background:

  • Estrus detection is vital for successful artificial insemination (AI) in beef cattle.
  • Current heat detection protocols vary significantly among farmers, impacting reproductive performance.
  • Optimizing estrus detection is essential for improving calving intervals and herd productivity.

Purpose of the Study:

  • To evaluate the efficacy of estrus detection methods in French beef herds.
  • To analyze the relationship between heat detection protocols and the interval from calving to first observed estrus.
  • To identify factors influencing heat detection accuracy and timeliness.

Main Methods:

  • A field study involving 878 lactating beef cows across 60 French herds.

Related Experiment Videos

  • Daily estrus recording by farmers and progesterone assays to determine cycling status.
  • Survival analysis (Kaplan-Meier curves, Cox proportional hazard model) to assess factors affecting estrus detection.

    • Main Results:

    • Only 71% of cows were observed in estrus by farmers, with a median interval of 56 days from calving to first estrus.
    • Significant discrepancies noted: 44% of cycling cows missed, 11% of non-cycling cows incorrectly identified as in estrus.
    • Increased time spent on heat detection (>1 hour daily) and AI use were linked to shorter calving-to-estrus intervals.

    Conclusions:

    • Many farmers' heat detection protocols are insufficient for optimal reproductive management, especially with earlier calving.
    • There is substantial room for improvement in estrus detection practices to enhance beef herd fertility.
    • Adopting more rigorous heat detection strategies and increasing farmer engagement are recommended.