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Fixed yield responses to increased milking frequency

R A Erdman1, M Varner

  • 1Animal Sciences Department, University of Maryland, College Park 20742, USA.

Journal of Dairy Science
|May 1, 1995
PubMed
Summary
This summary is machine-generated.

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Increasing dairy cow milking frequency to three times daily significantly boosts milk yield by a fixed 3.5 kg/d and fat yield by 92 g/d, irrespective of initial yield. This suggests uniform adjustments for milking frequency changes may be applicable.

Area of Science:

  • Animal Science
  • Dairy Science
  • Reproductive Physiology

Background:

  • Milking frequency is a key management practice influencing dairy cow productivity.
  • Optimal milking schedules are crucial for maximizing milk yield and composition.
  • Previous research suggests varying responses to milking frequency across different cow parities.

Purpose of the Study:

  • To systematically evaluate the impact of altered milking frequencies on milk and fat yield in dairy cows.
  • To determine if the yield response to increased milking frequency is dependent on a cow's baseline yield.
  • To assess the need for parity-specific adjustments in yield calculations based on milking frequency.

Main Methods:

  • A meta-analysis was conducted, summarizing data from 19 independent literature reports.

Related Experiment Videos

  • Linear regression analysis was employed to examine relationships between baseline yield and yield increases.
  • Comparisons included twice daily versus three times daily, once daily, and four times daily milking frequencies.

    • Main Results:

    • Milking three times daily increased milk yield by a consistent 3.5 kg/d (95% CI: 3.1–3.9 kg/d) and fat yield by 92 g/d (95% CI: 67–117 g/d) compared to twice daily milking.
    • No correlation was found between a cow's twice-daily yield and the additional yield gained from increasing milking frequency.
    • Responses in primiparous and multiparous cows were similar, challenging the necessity of separate adjustment factors.

    Conclusions:

    • Increased milking frequency from twice to three times daily provides a fixed yield increase, independent of the cow's initial milk or fat yield.
    • Current parity-specific adjustment factors for yield conversions may be redundant if adjustments are based on actual yield.
    • Limited data suggest fixed responses for once and four times daily milking, warranting further investigation.