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Related Experiment Videos

Dry matter intake from parturition to midlactation.

A F Kertz1, L F Reutzel, G M Thomson

  • 1Purina Mills, Inc., St. Louis, MO 63166.

Journal of Dairy Science
|July 1, 1991
PubMed
Summary

Accurate prediction of dry matter intake (DMI) in dairy cows is crucial for optimizing herd health and productivity. This study developed a refined equation for DMI, improving upon existing models for better management.

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Area of Science:

  • Animal Science
  • Dairy Nutrition
  • Ruminant Physiology

Background:

  • Dry matter intake (DMI) is a critical factor influencing dairy cow productivity and health.
  • Existing models for predicting DMI may not accurately reflect the dynamic changes in cows throughout lactation.

Purpose of the Study:

  • To quantitate the relationships among DMI, days in milk (DIM), body weight (BW), and fat-corrected milk (FCM) yield.
  • To develop and validate improved equations for predicting DMI in dairy cows.

Main Methods:

  • Utilized six years of individual feeding data from the Purina Research Center.
  • Developed predictive equations for DMI based on BW, 4% FCM, and DIM, with adjustments for different lactation periods.

Main Results:

  • The best overall DMI prediction equation was established: kg DMI = .008037 x kg BW + .3134 x kg 4% FCM + .2286 x DIM - .002176 x (DIM)^2 + .00000705 x (DIM)^3 (R^2 = .64).
  • Separate equations were most accurate when developed for specific weeks postpartum (up to 6 wk) and lactation periods (6-8, 9-13, 14-20 wk).
  • Commonly used equations and NRC estimates showed discrepancies, often over- or underestimating DMI compared to the developed model, particularly beyond 8 weeks postpartum.

Conclusions:

  • The developed DMI prediction equation offers improved accuracy across different stages of lactation compared to existing models.
  • Energy balance calculations indicated a more pronounced and extended energy deficit in later-lactation cows versus first-lactation cows.
  • Body weight loss alone is an insufficient indicator of energy status in early lactation dairy cows.

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