Topics:
Animal Nutrition, Animal Refresher
Species Using Chromic Oxide Markers
Chromic oxide is commonly used marker in digestion trial of:
- Avian
- Swine
- Carnivores
- All the above — Correct Answer
Explanation:
Correct Answer: All the above (Avian, Swine, Carnivores)
Chromic oxide (Cr₂O₃) is a completely indigestible, non-absorbed external marker used in digestibility trials across multiple species including avian, swine, and carnivores. It is given in known quantities and the ratio of marker to nutrient in faeces gives apparent digestibility.
Chromic Oxide Use by Species
| Species | Chromic Oxide Used? | Notes |
|---|---|---|
| Avian (poultry) | Yes ✓ | Useful because of cloaca collection challenge |
| Swine (pig) | Yes ✓ | Common in digestibility research |
| Carnivores (dog, cat) | Yes ✓ | Widely used in pet food research |
| Herbivores (ruminants) | Generally avoided ✗ | Uneven passage rate through rumen; less accurate |
Principle of Indicator Method
- Known amount of indigestible marker → consumed with feed.
- Ratio of marker concentration in feed vs faeces → digestibility coefficient.
- Internal indicators: Lignin, Silica, Acid Insoluble Ash (AIA).
- External indicators: Chromic oxide, Ferric oxide, Chromium-EDTA, Cerium.
Why Other Options Are Wrong
- Selecting only one species (Avian, Swine, or Carnivores alone) is incomplete — chromic oxide is used in all three.
📚 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.
