I have a white Pekin male and he is my only male that seems fertile. Can he be bred with my Sweds and Crested without hurting them, since he is so much bigger? I have a blue swed male, but he doesn't seem to be fertile when he mates with my crested. She is the only one laying eggs right now and the black swed females are not laying and they are the same age. When will they start laying?