Topics:
Animal Nutrition, Animal Refresher
Internal Indicators in Digestibility Estimation
Which of the following is/are used as internal (natural) indicators in digestibility estimation?
- Lignin only
- Silica only
- Acid Insoluble Ash (AIA) only
- All — Lignin, Silica, and AIA — Correct Answer
Explanation:
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.
