Fra Wikipedia: "Ægfarven har ikke noget med fjerfarven at gøre. Brune landhøns lægger f.eks. hvide æg, og hvide æglægningshøns lægger brunlige æg."
Som jeg læser det kan det være både-og. Så jeg surfede lidt mere, Fra wisegeek.com:
"Chicken eggs from various chicken breeds emerge in different shades because of pigments which are deposited as the eggs move through the hen's oviduct. The pigment depositions are determined by the chicken's genetics, with some breeds producing rich dark brown eggs, for example, while others lay snow white eggs. The eggs inside are essentially identical; there are no major flavor differences between chicken eggs from different birds, as the flavor is determined by the chicken's diet.
There are three main colors for chicken eggs. Most eggs in the store come in white or shades of brown. It is also possible to find blue to green chicken eggs, which come from the Aracuana, a breed of chicken developed in Chile. Araucanas have also been crossed with other breeds to produce the Americauna, sometimes called the “Easter egg chicken” in a reference to its multicolored eggs.
Originally, all chicken eggs were probably brown. Over time, people selectively bred chickens with progressively lighter eggs, ultimately producing white chicken eggs, which came to be the norm. Brown eggs were reintroduced to the market in the late 20th century, although people on farms were already quite familiar with the them. Some classic white egg laying breeds include Andalusians, Faverolles, Dorkings, Leghorns, and Lakenvelders. Barnevelders, Rhode Island Reds, Jersey Giants, Delawares, and Orpingtons are well known for their brown eggs, which vary in color from light cream to dark brown."
Konklusionen må være at det har med den enkelte race at gøre, men at undtagelser kan forekomme, dvs. den enkelte høne kan godt afvige.
Så lærte man det :)