Topics:
Animal Nutrition, Animal Refresher
Rumen Gas Production Rate
Rate of gas production in a cow during fermentation is:
- 30 Litre/hour — Correct Answer
- 5 Litre/hour
- 10 Litre/hour
- None
Explanation:
Correct Answer: 30 litres/hour
The rate of gas production in a cow's rumen during peak fermentation is approximately 30 litres per hour. The gas produced is a mixture of CO₂ : CH₄ in the ratio 65 : 35. This gas must be continuously eructated (belched); failure to do so causes bloat (ruminal tympany).
Ruminal Gas Production Parameters
| Parameter | Value |
|---|---|
| Rate of gas production (adult cow) | ~30 litres/hour |
| Gas composition ratio | CO₂ : CH₄ = 65 : 35 |
| Energy in methane | 13.34 kcal/gram |
| Energy lost as CH₄ | ~7% of gross energy intake (GEi) |
| Normal rumen pH | 6.5–6.8 |
| Optimum rumen temperature | 39°C |
Significance of Gas Production
- CH₄ production represents a significant energy loss from the ruminant system (~7% GEi).
- Methanogenic bacteria (Methanobacterium ruminantium) are responsible for CH₄ production.
- Bloat prevention: Simethicone (Bloatosil), mineral oil, or poloxalene added to diet.
Why Other Options Are Wrong
- 5 litres/hour → far too low; normal rumen fermentation generates much more gas.
- 10 litres/hour → below the established physiological rate for adult cattle.
- None → 30 litres/hour is the accepted standard value.
📚 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.
