Faecal Energy Loss in Ruminants
Faecal energy loss is approximately what percentage of gross energy intake in ruminants consuming roughage?
- 5–10% of GE
- 20–30% of GE
- 35–40% of GE
- 40–50% of GE — Correct Answer
Correct Answer: 40–50% of GE
In ruminants consuming roughages, faecal energy loss is very high — 40–50% of gross energy intake (GEi). This is because roughages have low digestibility due to high cell wall (cellulose, hemicellulose, lignin) content.
Faecal Energy Loss by Species and Diet
- Ruminants on roughage: 40–50% of GEi
- Ruminants on concentrate: 20–30% of GEi
- Horse: 35–40% of GEi
- Pig: 20% of GEi
Why is Faecal Loss so High in Ruminants on Roughage?
Lignin is completely indigestible. High fibre content = low digestibility = high faecal energy loss. Faecal energy loss is the single largest energy loss in ruminants, which is why 'improving roughage digestibility' (e.g., urea treatment) is so important.
📚 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.
