Poultry Judging Practice Test

What pigment is responsible for the color of the yolk in eggs?

1. Carotene

2. Xanthophyll

3. Chlorophyll

4. Melanin

The correct answer is: Xanthophyll

The color of the yolk in eggs is primarily influenced by the presence of xanthophyll, a type of carotenoid pigment. Xanthophyll is responsible for the yellow to orange hues typically seen in egg yolks. The intensity of the yolk's color can vary depending on the bird's diet; for example, hens that consume foods rich in xanthophyll, such as green leafy plants, corn, and alfalfa, will produce eggs with darker yolks. Carotene is another pigment that contributes to color in foods and can impact yolk color, but it is xanthophyll that is specifically recognized for its significant role in giving yolks their characteristic shades. Chlorophyll, while a pigment found in plants, is not present in significant amounts in egg yolks and does not contribute to their color. Melanin is associated with dark pigmentation in animals and does not play a role in yolk coloration either. This understanding of pigments and their sources in relation to poultry judging is crucial, as it helps in assessing the quality and nutritional aspects of eggs.