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Related Experiment Videos

The predictive value of pelvimetry in beef cattle

J Van Donkersgoed1, C S Ribble, C W Booker

  • 1Veterinary Infectious Disease Organization, Saskatoon, Saskatchewan.

Canadian Journal of Veterinary Research = Revue Canadienne De Recherche Veterinaire
|July 1, 1993
PubMed
Summary

Pelvimetry, a method to measure pelvic size in cattle, is unreliable for predicting calving difficulty (dystocia). This study found pelvic measurements and related techniques are poor predictors of dystocia in beef cows.

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Area of Science:

  • Veterinary Medicine
  • Animal Science
  • Reproductive Biology

Background:

  • Pelvimetry is a technique used to measure pelvic dimensions in cattle.
  • It is hypothesized that smaller pelvic areas contribute to calving difficulty (dystocia).
  • The predictive accuracy of pelvimetry for dystocia in beef cattle requires further investigation.

Purpose of the Study:

  • To evaluate the reliability and generalizability of pelvimetry for predicting dystocia in beef cattle.
  • To assess various modifications of pelvimetry techniques.
  • To determine the statistical association between pelvic area measurements and dystocia.

Main Methods:

  • Data collected from 1146 heifers and 210 cows across five beef herds.
  • Assessed repeatability of pelvic area measurements using Rice and Krautmann pelvimeters.

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  • Evaluated predictive values (sensitivity, positive predictive value) of measurements and modified techniques.

    • Main Results:

    • Pelvic area measurements showed low to moderate repeatability, indicating imprecision.
    • Positive predictive values and sensitivities were consistently poor across various factors.
    • Modified techniques (ratios, equations) also demonstrated poor predictive performance for dystocia.

    Conclusions:

    • Pelvimetry is an imprecise and unreliable on-farm test for predicting dystocia in beef cattle.
    • There is substantial overlap in pelvic measurements between heifers that experience dystocia and those that do not.
    • Evidence does not support the continued use of pelvimetry to reduce dystocia in beef herds.