Why does the egg yolk change depending on different foods you feed chickens?

The color of an egg yolk is primarily determined by the diet of the hen that laid it. Certain feed ingredients contain pigments called carotenoids, which are deposited in the yolk during the egg formation process. Here are some common foods and their impact on egg yolk color:

1. Marigold Petals or Dried Marigolds: Marigolds are rich in lutein and zeaxanthin, which are carotenoids that give egg yolks a deep yellow to orange color.

2. Corn: Corn is another good source of lutein and zeaxanthin. Feeding chickens corn can result in egg yolks with a yellow-orange hue.

3. Alfalfa: Alfalfa contains various carotenoids, including beta-carotene, lutein, and zeaxanthin. Adding alfalfa to the chicken's diet can enhance the yolk's yellow color.

4. Spinach, Kale, or Other Leafy Greens: These greens contain lutein and beta-carotene, contributing to a darker yellow or slightly greenish tint in egg yolks.

5. Carrots: Carrots are rich in beta-carotene, which can give egg yolks a more orange or reddish color.

6. Grains: Grains such as wheat and barley contain some carotenoids, but their contribution to egg yolk color is generally less significant compared to the above-mentioned ingredients.

7. Commercial Chicken Feed: Many commercially produced chicken feeds are fortified with carotenoids or natural pigments to ensure consistent egg yolk color. These feeds often contain marigold extract, paprika, or other carotenoid-rich ingredients.

It's important to note that the exact color of the egg yolk can vary based on the specific type and amount of feed consumed, as well as the breed of the hen and other factors. While modifying the diet can influence the yolk color, it's primarily done for aesthetic purposes and doesn't significantly affect the nutritional value of the eggs.