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Assessing liner performance using on-farm milk meters.

J F Penry1, S Leonardi2, J Upton3

  • 1Department of Dairy Science, University of Wisconsin-Madison, Madison 53706.

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Summary

This study found that higher vacuum levels and pulsation settings increase average milk flow rates. Liner compression significantly impacts milk flow, with gentler conditions minimizing differences between liner types.

Keywords:
average milk flow rateliner performancemilking speedmilking vacuumpulsation settings

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Area of Science:

  • Dairy Science
  • Agricultural Engineering
  • Animal Husbandry

Background:

  • Liner performance is crucial for efficient and effective milking in dairy operations.
  • Understanding the interplay of liner compression, vacuum, and pulsation is essential for optimizing milk flow rates.

Purpose of the Study:

  • To quantify and compare the interactive effects of liner compression, milking vacuum level, and pulsation settings on average milk flow rates.
  • To evaluate a methodology for assessing liner performance applicable to commercial dairy farms.

Main Methods:

  • Assessed eight liner types using nine milking system vacuum and pulsation combinations on 80 cows over 36 days.
  • Employed a central composite experimental design to create response surfaces for average milk flow rate (AMFf) based on milking variables.
  • Compared liner performance under standardized conditions of claw vacuum and milk ratio.

Main Results:

  • Highest average milk flow rate fraction (AMFf) observed at high milking system vacuum (Vsystem), high pulsator ratio (PR), and high overpressure.
  • All liners demonstrated increased AMF with improved milking conditions (higher claw vacuum and milk ratio).
  • Liner differences in AMF were smallest under gentle milking conditions and increased with liner overpressure.

Conclusions:

  • Milking system vacuum, pulsation settings, and liner compression significantly influence average milk flow rates.
  • Liner performance assessment methodology using a central composite design can be improved for commercial parlors.
  • Optimizing milking parameters and selecting appropriate liners are key to maximizing milk yield and cow comfort.