Topics:
Animal Refresher, Poultry Science
Yellow Colour of Egg Yolk
The characteristic yellow colour of egg yolk is due to:
- Xanthophyll
- Carotene — Correct Answer
- Riboflavin
- Biotin
Explanation:
Correct Answer: Carotene
The yellow-orange colour of egg yolk is primarily due to carotenoid pigments, particularly carotene (β-carotene) and xanthophylls deposited from the hen's diet.
Important Note
- Carotene: Responsible for yellow-orange yolk colour — derived from feed (maize, green leaves).
- Xanthophyll: Also a carotenoid; responsible for yellow colour in skin and shanks of poultry. In some references, xanthophylls also contribute to yolk colour.
- Riboflavin (Vitamin B2): Responsible for greenish colour in egg white (albumin) — not yolk.
- Biotin: A B-vitamin involved in fat metabolism, not pigmentation.
Feeding maize (corn) or dried marigold petals enriches yolk colour due to their high carotenoid content.
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This multiple choice question is from Animal Refresher, Poultry Science. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Refresher to strengthen your preparation.
