I have silver ameraucanas that need some help in the size and vigor areas. I hatched a very nice large black ameraucana cockerel from a nice blue egg this spring. I am thinking of putting him over the silver hens I have. I am pretty sure the black cockerel has birchen genes as his legs are slate. My end goals are to increase size, get some hybrid vigor the new blood should introduce, maintain the egg color and get a nice black breast on the males. The males right now are speckled with white in the breast and seem to be lacking silver in the hackles and saddles. The females are looking nice and to the standard, except for the size. My question: Is it better to put a silver male over a larger black hen or a large black male over the silver hens? Please remember to answer in terms that are suitable for a person who needs to read the book, "Chicken Genetics for Dummies".