Topics:
Animal Nutrition, Animal Refresher
Most Common NPN Source
Most commonly used NPN in ruminant ration is:
- Biuret
- Urea — Correct Answer
- DAP
- None
Explanation:
Correct Answer: Urea
Urea is the most widely used Non-Protein Nitrogen (NPN) source in ruminant rations because it is cheap, readily available, contains high nitrogen (46.6%), and is 100% degradable in the rumen.
Urea as NPN — Key Facts
| Property | Value |
|---|---|
| Nitrogen content (pure) | 46.6% |
| Rumen degradability | 100% (fully converted to NH₃) |
| Energy value | None |
| Mineral content | Deficient in all minerals |
| Use in diet | Ruminants only; up to 3% of concentrate |
Other NPN Sources (Less Common)
- Biuret → NPN; less degradable than urea; safer but less efficient
- DAP (Diammonium phosphate) → NPN + phosphorus source
- Ammonium sulphate → NPN + sulphur source
- Urea is preferred because it is most economical and widely available
Why Other Options Are Wrong
- Biuret → NPN source but less widely used; more expensive, slower degradation
- DAP → used more as phosphorus source; not the primary NPN source
- None → incorrect; urea is specifically the most commonly used NPN in ruminant rations
📚 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.
