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The relationship between milking interval and somatic cell count in automatic milking systems.

H Mollenhorst1, M M Hidayat, J van den Broek

  • 1Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands. h.mollenhorst@uu.nl

Journal of Dairy Science
|August 23, 2011
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Summary

Milking interval variation, not the interval itself, is linked to somatic cell count (SCC) in automatic milking systems. This suggests milking consistency is key for udder health in dairy cows.

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Area of Science:

  • Dairy Science
  • Animal Husbandry
  • Veterinary Epidemiology

Background:

  • Somatic cell count (SCC) is a key indicator of udder health in dairy cattle.
  • Automatic milking systems (AMS) offer insights into milking patterns and their impact on animal health.
  • Understanding factors influencing SCC is crucial for optimizing dairy herd management and milk quality.

Purpose of the Study:

  • To investigate the relationship between milking interval, milking interval variation, and somatic cell count (SCC) in dairy cows managed under automatic milking systems.
  • To determine if milking interval or its variability is a significant predictor of SCC, independent of production, lactation stage, and parity.

Main Methods:

  • Utilized data from 100 dairy farms employing automatic milking systems.
  • Collected data included milking intervals, production rates, somatic cell counts (SCC), parity, and days in milk.
  • Employed a linear mixed model with farm as a random variable to analyze associations with log10-transformed SCC.

Main Results:

  • All main effects, including milking interval and its variation, were significantly associated with SCC.
  • The variation in milking intervals demonstrated a stronger positive relationship with SCC than the milking interval itself.
  • The direct effect of milking interval on SCC was found to be marginal when accounting for other influential factors.

Conclusions:

  • Milking interval variation is a more critical factor than the absolute milking interval in influencing somatic cell count (SCC) in automatic milking systems.
  • While significant, the overall association between milking interval and SCC in AMS environments is limited when other production and animal factors are considered.
  • Optimizing milking routine consistency may be a key strategy for improving udder health and milk quality in automated dairy operations.