Topics:
Animal Nutrition, Animal Refresher
Match: Van Soest Detergent Fiber System
MATCH THE COLUMN: (Von Soest method)
| TABLE-I | TABLE-II |
|---|---|
| 1. Acid detergent fibers (ADF) | (a) Sodium Lauryl-Sulphate |
| 2. Neutral detergent | (b) CTAB |
| 3. Acid detergent | (c) Cellulose, lignin, silica |
| 4. Acid detergent soluble (ADS) | (d) Hemicellulose |
- 1-c, 2-a, 3-b, 4-d — Correct Answer
- 1-a, 2-c, 3-b, 4-d
- 1-c, 2-b, 3-a, 4-d
- 1-d, 2-a, 3-b, 4-c
Explanation:
Correct Answer: 1-c, 2-a, 3-b, 4-d
In the Van Soest detergent fibre analysis system, each fraction has a specific chemical composition and uses a specific detergent reagent for its preparation.
Van Soest System — Matching
| Fraction | Composition / Reagent | Notes |
|---|---|---|
| 1. Acid Detergent Fibre (ADF) | (c) Cellulose, Lignin, Silica | Residue after boiling with CTAB in H₂SO₄ |
| 2. Neutral detergent reagent | (a) Sodium Lauryl Sulphate | Used at pH7; produces NDF and NDS |
| 3. Acid detergent reagent | (b) CTAB (Cetyl Trimethyl Ammonium Bromide) | In 1N H₂SO₄; applied to NDF to give ADF and ADS |
| 4. Acid Detergent Soluble (ADS) | (d) Hemicellulose | NDF − ADF = Hemicellulose (dissolved by acid detergent) |
Van Soest System — Complete Summary
- NDF = Hemicellulose + Cellulose + Lignin + Silica
- ADF = Cellulose + Lignin + Silica
- ADS (NDF−ADF) = Hemicellulose
- NDS = Soluble carbohydrates, starch, proteins, pectins
Why Other Options Are Wrong
- 1-a, 2-c, 3-b, 4-d → assigns Sodium Lauryl Sulphate to ADF composition; incorrect
- 1-c, 2-b, 3-a, 4-d → swaps the neutral and acid detergent reagents
📚 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.
