Topics:
Animal Nutrition, Animal Refresher
External Indicators in Digestibility Estimation
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Question (English)
Which of the following is/are used as external indicators in digestibility estimation?
- Chromic oxide only
- Carmine red dye only
- Magnesium ferrite only
- All — Chromic oxide, Carmine red dye, and Magnesium ferrite ✓ Correct
Explanation:
Correct Answer: All the above
- Chromic oxide (Cr₂O₃): Most commonly used external indicator; given as green powder in feed. Used in poultry, swine, carnivores. NOT used in herbivores (irregular passage gives inaccurate results).
- Carmine red dye: Food-grade dye used to mark start/end of faecal collection periods.
- Magnesium ferrite: Solid-phase external marker.
Chromic oxide is not used in herbivores because it does not give accurate results.
📚 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.
