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Characterizing Intraruminal Differences of the pH and Fermentation in Cattle
Elsayed Mickdam1,2, Ezequias Castillo-Lopez2, Raul Rivera-Chacon2
1Nutrition and Clinical Nutrition Department, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt.
Animal Science Journal = Nihon Chikusan Gakkaiho
|July 26, 2026
Summary
Ventral ruminal pH can indicate dorsal ruminal pH in cows, but this association is more reliable with grain-rich diets. This finding impacts monitoring cow rumen health and diet formulation.
Area of Science:
- Ruminant nutrition
- Animal physiology
Background:
- Rumen pH monitoring is crucial for cattle health.
- Understanding the relationship between dorsal and ventral rumen pH is important for accurate assessment.
Purpose of the Study:
- To characterize the association between ventral and dorsal ruminal pH in Holstein cows.
- To evaluate the reproducibility of ventral ruminal pH as a proxy for dorsal ruminal pH under different dietary conditions.
Main Methods:
- Six nonlactating, rumen-cannulated Holstein cows were used.
- Cows were fed either a grain-rich (65% concentrate) or a forage-only diet.
- Indwelling systems continuously recorded dorsal and ventral ruminal pH; volatile fatty acid concentrations and osmolality were also measured.
Main Results:
- A high concordance correlation coefficient (0.857) was observed between ventral and dorsal ruminal pH with grain-rich diets.
- A low concordance correlation coefficient (0.467) was found with forage-only diets.
- Accuracy and precision varied between diets, with higher reproducibility for ventral pH as a proxy for dorsal pH in grain-rich diets.
Conclusions:
- Ventral ruminal pH can serve as a proxy for dorsal ruminal pH in cows.
- The reliability of this proxy is significantly higher when cows are fed grain-rich diets compared to forage-only diets.
- This highlights the importance of diet composition in rumen pH monitoring strategies.
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