In the first week or two of mar.2017 I bought 10 chicks (all hens) from a local Rural king store, and only 4 months later (today) one hen is laying a very small egg, they'll get bigger with time, after my 3yo daughter and I calmed down from finding this small egg I took plenty of pics of it and sent them to everyone I know, hehehehe. I decided to cook the egg and let my little girl eat it, So dad cooked it up and it was soooo dark orange, I was very pleased, it brought back memories of my chickens I had years ago. All I've ever done to obtain this dark orange colored yolk is a mixture of free range, quality feed (whole/cracked corn, scratch grains etc. I do use pureina layena oyster strong feed. But one thing I have done with all chickens I've ever had was feed lots of berries.. I'll pick huge freezer bags full of raspberries,blackberries, and I have blueberry bushes that yield very generously. I have so much I can feed them all winter. There's nothing healthier than berries. It's worth a try.