Poultry Judging Practice Test

Which factor primarily affects the coloration of egg yolks?

1. Breed of the hen

2. Diet of the hen

3. Age of the hen

4. Light exposure

The correct answer is: Diet of the hen

The coloration of egg yolks is primarily influenced by the diet of the hen. Hens that consume a diet rich in carotenoids, which are pigments found in various plant materials, tend to produce eggs with darker yellow or orange yolks. Common dietary sources that enhance yolk color include yellow corn, marigold petals, and alfalfa. In contrast, a diet lacking in carotenoids, such as a primarily wheat-based feed, will result in paler yolks. While factors such as the breed of the hen, age of the hen, and light exposure may have some effect on yolk color, the direct and most significant influence comes from the specific nutrients in the hen's diet. Understanding the importance of diet helps poultry producers to create optimal feeding strategies that yield eggs with the desired yolk color for market preferences.