Why do Chickens Lay Blue Eggs?
To explain what makes an egg blue, green or brown, we need to dive into some interesting genetics. A Dominant O-gene on chromosome 1, called Oocyan, determines the blue-egg laying gene. Unlike the BI gene, which controls the color of the feathers, the OOcyan gene affects eggshell color.
Determining why a chicken lays a specific egg color can be complicated, but it can be simplified by understanding that genetics play a crucial role. Certain chicken breeds are genetically predisposed to lay blue eggs, while hybrid chickens are often intentionally bred to carry the blue egg gene by crossing them with breeds that carry that gene.