I'm not sure which part or all of my feeding regime is responsible for the dark orange yolks, but I wasn't taking any chances. I live close to Joel Salatin/Polyface Farms and I have bought his eggs, and as everyone knows he is the king of pastured poultry, and his eggs don't have yolks near that dark or that tasty. He gets $4 a dozen for all the eggs he can produce. He feeds local grain that is non-gmo, but he doesn't feed organic.
I also live close to Countryside Organics and have been a customer since they opened in 1997, and I have always been an organic gardener, so there was never any doubt that I would only use their feed. The fact that they use high protein field peas in place of the soy also contributes to the "greens" that help make the dark yolks.
This is an adventure for me. In order to keep the orange yolks coming over the winter, I am growing several varieties of pumpkins and winter squash to put in my root cellar for the months without forage. I'm also growing lots of cabbage and beets to go along with the pumpkins. I started a big patch of comfrey, also, but haven't decided the best way to put some up for the winter.