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A scoring system for grading corkscrew claws in dairy cattle.

N Capion1, A M Rinken2, C Christensen3

  • 1Department of Veterinary Clinical Sciences, Faculty of Medical Sciences, Univeristy of Copenhagen, Agrovej 8, Taastrup 2630, Denmark.

Veterinary Journal (London, England : 1997)
|March 10, 2024
PubMed
Summary

A new scoring system for corkscrew claw (CC) in dairy cattle was developed using axial wall width. This system effectively categorizes CC severity and shows good agreement among observers, aiding in future research.

Keywords:
Claw deformitiesCorkscrew clawsInterobserver variationScoring system

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Area of Science:

  • Veterinary Medicine
  • Animal Science
  • Podiatry

Background:

  • Corkscrew claw (CC) is an emerging progressive claw deformity in dairy cattle with unknown causes.
  • The condition's irreversible nature and association with lameness necessitate a standardized method for assessment.
  • Current understanding of CC aetiology, pathogenesis, and treatment is limited due to a lack of defined severity metrics.

Purpose of the Study:

  • To develop and evaluate a reproducible scoring system for corkscrew claw (CC) in dairy cattle.
  • To establish objective measurements from photographic data to quantify CC severity.
  • To assess the correlation between different morphological parameters of CC.

Main Methods:

  • Analysis of 393 photographs of dairy cattle claws affected by CC.
  • Measurement of axial wall width, toe-to-floor contact, and distal abaxial wall angle.
  • Development of a scoring system based on axial wall width intervals (mild, moderate, severe).
  • Evaluation of interobserver agreement using Cohen's weighted kappa among claw trimmers and trained observers.

Main Results:

  • A significant positive linear correlation (r=0.91) was found between axial wall width and distal abaxial wall angle.
  • Increasing axial wall width correlated with decreased toe-to-floor contact, particularly in mild and moderate CC.
  • The developed CC scoring system demonstrated substantial to almost perfect interobserver agreement.

Conclusions:

  • The proposed scoring system based on axial wall width provides a reliable method for quantifying corkscrew claw severity in dairy cattle.
  • This standardized approach is crucial for consistent data collection in future studies on CC aetiology, risk factors, and treatment efficacy.
  • The high interobserver agreement suggests the scoring system is practical for use by both trained and untrained personnel in herd health management.