Topics: Animal Nutrition, Animal Refresher

Proximate Principle Calculated by Difference

Question

Which proximate principle is not determined by laboratory analysis but is simply calculated by difference?

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Question (English)

Which proximate principle is not determined by laboratory analysis but is simply calculated by difference?

  1. Crude Fibre (CF)
  2. Crude Protein (CP)
  3. Total Ash
  4. Nitrogen-Free Extract (NFE) ✓ Correct
Explanation:
Correct Answer: NFE (Nitrogen-Free Extract)

NFE is the ONLY proximate principle never directly analysed. Formula:

NFE% = 100 − (CP% + EE% + CF% + Ash%)

What NFE Represents

Mainly easily digestible carbohydrates — monosaccharides and disaccharides (glucose, fructose, sucrose, lactose, maltose). It is the primary energy source in most feeds.

Limitation

NFE is not chemically defined — includes all components not accounted for by other fractions, including measurement errors.

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