our free range chickens lay eggs with very yellow, almost orange yokes. I've read that professional egg farms feed their chickens a derivative from the marigold, high is saffron, to keep the yokes yellow.
There is a trade off for free range chickens. We loose many to predators.
Years ago, a former neighbor would put about 100 chickens out in his pasture every spring; they roosted in the barn. By fall he’d only have 20 or 30 left. When he would put them out, I’d rib him about having just refilled his coyote feeder.
I call my grandkid’s eggs survivor chicken eggs because of all the chickens they have lost to predators. They even had vultures attack & kill their chickens.
Pumpkins are a good winter feed for laying chickens. Brings back the nice colored yokes & helps keep up the laying.