Is it possible to get the dark, rich yolks when the birds are in a run and can't free range? I've been supplementing alfalfa to their diet as well as some kitchen scraps, to no effect. The eggs are indistinguishable from commercial eggs. They are on Purina Flock Raiser until they all start laying. Then I plan to try Layena, since I've heard it might help. Does anyone have a secret ingredient that helps? TIA!