did you mean my (broken) hatching egg's yolk? egg yolk color is determined by diet, not genetics -- and the eggs were shipped from texas, where they're in the middle of an insane drought, so i don't expect the breeder was free-ranging her flock; probably not much to free-range on. has nothing to do with the quality of the egg itself, i.e. the likelhood that it's fertile or viable.
although it's funny, i posted the same photo on instagram/facebook, and was surprised by how many people assumed the pale yolk color was due to being force-fed hormones or housed in a gigantic corporate chicken factory or etc. -- which it most definitely was not. we really DO need to learn more about what we eat -- in a good way, i love that my friends had such good intentions, but they didn't realize that not all insane food-production practices are visible in the end product... and that some rather benign issues ARE visible.
I give my chickens Kale, cabbage, nappa cabbage or something green each day. Good feed also has marigold extract that makes the eggs a darker orange. The fear with the light color yolk is the health of the flock which will lower hatch rate and hatchability.
Hopefully the flock was healthy and the color was not an indicator of poor flock health. It is a good thing that you give the chicks vitamins when they hatch. Like you posted above, the orange color does not always mean better quality since it can be manipulated by feed additives.