Can what you feed your birds effect their shell colors? I have a dominique roo and hens and some BO hen and their eggs look so similar, I was thinking of selling some of the dominique eggs, but really can't tell them apart from the BO eggs, could I feed the Dom's something to tint their eggs a bit to be able to tell the difference? I really don't want to seperate the roo and the hens from the coop, as I just barely got him back in the coop. The girls were beating him up badly and he was in the chicken hospital for a few days, and every time I tried to put him back they would clobber him. So finally after about a month, I was able to get him back in, and he is back to doing his roosterly duties. Thanks for your help!!