Internal Indicators in Digestibility Estimation

Question Question

Which of the following is/are used as internal (natural) indicators in digestibility estimation?

Select an answer

Lignin only
Silica only
Acid Insoluble Ash (AIA) only
All — Lignin, Silica, and AIA

Internal Indicators in Digestibility Estimation

Which of the following is/are used as internal (natural) indicators in digestibility estimation?

Options

Lignin only
Silica only
Acid Insoluble Ash (AIA) only
All — Lignin, Silica, and AIA ✓

Correct Answer: D

Explanation in English

Correct Answer: All — Lignin, Silica, and Acid Insoluble Ash (AIA)

Internal indicators are naturally present in feed, indigestible, and allow digestibility calculation without total faecal collection:

Lignin: Completely indigestible cell wall component
Silica: Inorganic; abundant in straws/grasses; also inhibits digestibility
AIA (Acid Insoluble Ash): Most reliable internal indicator; siliceous matter insoluble in acid

External Indicators (for contrast)

Chromic oxide, Carmine red dye, Magnesium ferrite (solid phase); PEG, Co-EDTA, Cr-EDTA (liquid phase).

📚 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.

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