Topics:
Animal Nutrition, Animal Refresher
Rumen VFA Production Ratio
The ratio of production of Acetate : Propionate : Butyrate in the rumen is:
- 65 : 10 : 20
- 65 : 20 : 10 — Correct Answer
- 10 : 20 : 65
- 70 : 15 : 10
Explanation:
Correct Answer: 65 : 20 : 10
Under normal feeding conditions (mixed diet of roughage and concentrate), the rumen VFA profile is:
- Acetate: 65% — predominant VFA; used for milk fat synthesis
- Propionate: 20% — gluconeogenic; used for milk sugar (lactose) and body glucose
- Butyrate: 10% — used by ruminal epithelial cells; precursor to ketone bodies
Dietary Effects on VFA Ratio
- High roughage diet: ↑ Acetate → ↑ Milk fat% (A:P ratio increases)
- High grain/concentrate diet: ↑ Propionate → ↑ Milk yield, ↓ Milk fat% (A:P ratio decreases)
Total VFA Facts
- Total VFA concentration: 80–120 mEq/L of rumen liquor
- Total VFA produced by adult cow: ~4 kg/day
- VFAs provide 70% of ruminant energy needs
📚 About this Topic — Animal Nutrition
This multiple choice question is from Animal Nutrition, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Nutrition to strengthen your preparation.
