Topics:
Animal Nutrition, Animal Refresher
Indigestible Proximate Principle
Digestibility cannot be determined for which of the following proximate principle?
- Total Ash — Correct Answer
- NFE
- CF
- CP
Explanation:
Correct Answer: Total Ash
The digestibility of Total Ash cannot be determined because minerals (ash) do not contribute to the energy content of a feed, and the concept of "digestibility" for ash is not practically applicable in the Weende system context.
Proximate Principles — Digestibility Status
| Proximate Principle | Digestibility Determinable? | Reason |
|---|---|---|
| Crude Protein (CP) | Yes ✔ | Digestible CP (DCP) is routinely estimated |
| Ether Extract (EE) | Yes ✔ | Digestible EE (DEE) is measured |
| Crude Fibre (CF) | Yes ✔ | Digestible CF (DCF) is estimated |
| NFE | Yes ✔ | Digestible NFE (DNFE) is calculated |
| Total Ash | No ✘ | Does not contribute to energy content; minerals are absorbed/excreted independently |
TDN Formula
- TDN% = DCP% + DCF% + DNFE% + (DEE% × 2.25)
- Notice: Ash is excluded from TDN calculation
Why Other Options Are Wrong
- NFE → cannot be determined by analysis but can be calculated by difference; digestibility of NFE IS determinable
- CF → digestibility CAN be determined by digestion trial
- CP → DCP is one of the most commonly measured nutritional parameters
📚 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.
