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The roo or the hen can be either. It is the genetic you want to make olive eggers. I have been using a dark egg roo over green egg layers. I am going to do the opposite in the spring. My marans pullets/hens are going in with my Ameraucanas. Later in the fall I am probably going to use a Lavender Am roo x Marans and then another pen with a CCL x Marans..... we will see what happens.
Either combo should work.... Pea Combs are really the ones I would keep for Olive Eggs, really they are your best shot at olive. NOT A GUARANTEE either way though. I have Pea combs laying brown eggs.... well I did.... I sold her today.