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Somatic cell count during and between milkings.

R G M Olde Riekerink1, H W Barkema, W Veenstra

  • 1Department of Health Management, University of Prince Edward Island, Charlottetown, C1A 4P3 Canada. rolderiek@upei.ca

Journal of Dairy Science
|July 20, 2007
PubMed
Summary

Sampling time significantly impacts somatic cell count (SCC) accuracy for detecting intramammary infection (IMI). For reliable results, collect milk samples immediately before milking to ensure accurate udder health assessments.

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Area of Science:

  • Veterinary Medicine
  • Dairy Science
  • Animal Health

Background:

  • Somatic cell count (SCC) is a key indicator of intramammary infection (IMI) in dairy cows.
  • Diurnal variations in SCC can affect diagnostic accuracy.
  • Understanding optimal milk sampling times is crucial for effective udder health management.

Purpose of the Study:

  • To evaluate how sampling time influences the sensitivity and specificity of SCC for IMI detection.
  • To identify the specific cells contributing to diurnal SCC fluctuations.

Main Methods:

  • Milk samples were collected from six Canadian dairy herds at various time points between milkings.
  • SCC and cell differentials were analyzed for each quarter.
  • Sensitivity and specificity of SCC were calculated based on sampling time.

Main Results:

  • SCC in uninfected quarters increased for up to 7 hours post-milking.
  • Pre-p.m. SCC was lower than pre-a.m. SCC in uninfected quarters.
  • SCC specificity for IMI decreased significantly after morning milking, with increased polymorphonuclear leukocytes post-milking.

Conclusions:

  • Milk sampling immediately before milking is essential for accurate SCC interpretation.
  • Sampling time critically affects the reliability of SCC as an IMI indicator.
  • Veterinarians and advisors should standardize pre-milking sampling for consistent udder health monitoring.