Topics:
Animal Nutrition, Animal Refresher
Classification of Indigestible Carbohydrates
Portion of carbohydrate which is not easily digestible like: cellulose, hemicellulose & lignin are fall under category of:
- NFE
- CF — Correct Answer
- EE
- TDN
Explanation:
Correct Answer: CF (Crude Fibre)
The portion of carbohydrates that is not easily digestible — including cellulose, hemicellulose, and lignin — falls under the category of Crude Fibre (CF) in the Weende proximate analysis system.
Carbohydrate Fractionation — Weende System
| Fraction | Components | Digestibility |
|---|---|---|
| Crude Fibre (CF) | Cellulose, Hemicellulose, Lignin | Not easily digestible |
| Nitrogen-Free Extract (NFE) | Monosaccharides, Disaccharides, easily digestible starches | Easily digestible |
Van Soest System (Overcomes Weende Limitation)
- NDF (Neutral Detergent Fibre) = Hemicellulose + Cellulose + Lignin + Silica (plant cell wall)
- ADF (Acid Detergent Fibre) = Cellulose + Lignin + Silica
- ADS (Acid Detergent Soluble) = Hemicellulose (NDF − ADF)
- Limitation of Weende: Some hemicellulose goes to NFE, some to CF → unrealistic partition
Why Other Options Are Wrong
- NFE → the easily digestible carbohydrate fraction (monosaccharides, disaccharides)
- EE (Ether Extract) → lipid fraction; contains fat-soluble vitamins, wax, cholesterol; not carbohydrate
- TDN → a measure of energy value, not a carbohydrate fraction
📚 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.
