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Related Experiment Videos

Modeling ruminal pH fluctuations: interactions between meal frequency and digestion rate

R E Pitt1, A N Pell

  • 1Department of Agricultural and Biological Engineering, Cornell University, Ithaca, NY 14853, USA.

Journal of Dairy Science
|November 15, 1997
PubMed
Summary

A new model for ruminal carbohydrate digestion predicts that feeding frequency and diet composition significantly impact rumen pH. Lower digestion rates improve model accuracy, suggesting fewer meals are needed to maintain stable rumen conditions.

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Area of Science:

  • Ruminant nutrition
  • Animal physiology
  • Mathematical modeling

Background:

  • Ruminal pH is critical for digestive health and microbial function in ruminants.
  • Diet composition and feeding strategies influence ruminal pH dynamics.

Purpose of the Study:

  • To develop and validate a steady periodic model for ruminal carbohydrate digestion.
  • To predict the effects of diet and meal frequency on ruminal pH fluctuation.

Main Methods:

  • Developed a mathematical model for ruminal carbohydrate digestion.
  • Validated the model using existing data and in vitro gas production rates.
  • Simulated ruminal pH changes under varying dietary effective neutral detergent fiber (NDF) and meal frequencies.

Main Results:

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  • Model accuracy improved with lower carbohydrate digestion rates obtained from in vitro gas production.
  • Revised digestion rates indicated a lower minimum meal frequency (3-6 meals/d) to maintain rumen stability compared to original rates (4-12 meals/d).
  • Effective NDF requirements for maintaining pH > 6.0 were slightly reduced with revised digestion rates.

Conclusions:

  • Carbohydrate digestion rates significantly influence predictions of ruminal pH stability.
  • Meal frequency and dietary NDF are key factors in managing ruminal pH.
  • Model predictions are sensitive to the digestion rate data used.