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Regularly fluctuating somatic cell count pattern in dairy herds.

Z Deng1, T J G M Lam2, H Hogeveen3

  • 1Department Population Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3584 CL Utrecht, the Netherlands.

Journal of Dairy Science
|July 19, 2021
PubMed
Summary
This summary is machine-generated.

A novel regularly fluctuating somatic cell count (SCC) pattern was identified in nearly 5% of cows using automatic milking systems (AMS). This intriguing udder health phenomenon requires further investigation to understand its underlying mechanisms and clinical significance.

Keywords:
automatic milking systemmastitisregularly fluctuating somatic cell count

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Area of Science:

  • Veterinary Medicine
  • Animal Health Monitoring
  • Dairy Science

Background:

  • Online somatic cell count (SCC) measurement in automatic milking systems (AMS) enables continuous monitoring of dairy cow udder health.
  • A previously undescribed, regularly fluctuating SCC (rfSCC) pattern has been observed in cows managed with AMS.

Purpose of the Study:

  • To determine the prevalence of the rfSCC pattern in cows milked by AMS.
  • To characterize the specific features of the rfSCC pattern.
  • To identify potential factors associated with the occurrence of the rfSCC pattern.

Main Methods:

  • Analysis of 30-day composite SCC recordings from 1,000 cows across 55 dairy herds in 6 countries using AMS.
  • Identification and characterization of the rfSCC pattern based on SCC data.
  • Correlation of rfSCC pattern with bacteriological culture data from quarter-milk samples in one herd.

Main Results:

  • The rfSCC pattern was identified in 4.7% of the analyzed 30-day SCC episodes.
  • Key characteristics of rfSCC episodes included a median SCC of 701 × 10^3 cells/mL, median amplitude of 552 × 10^3 cells/mL, and median cycle length of 4.1 days.
  • No clear association was found between specific mastitis-causing pathogens and the rfSCC pattern in the studied herd.

Conclusions:

  • A notable rfSCC phenomenon exists in dairy cows managed with AMS, affecting approximately 5% of cows during a one-month period.
  • The etiological basis for this regularly fluctuating SCC pattern remains unclear.
  • Further research is essential to ascertain the clinical importance of the rfSCC pattern for udder health and to elucidate its causative mechanisms.