Hello, I have a question regarding fertility issues. I have two hens, one BO, and one a mutt. I have them together with two BO roosters. Both hens lay eggs regularly, and I collected 16 eggs over 10 days for incubation, 8 BO, 8 mutt. I know the rooster has " relations" with the BO hen regularly from visual sightings. Lol.. After 10 days, I candled them, last pm, and every one of the mutt hens eggs had an embryo, and every one of the BO's eggs were empty. ?? I really only did this incubation to get the purebred BO's. Does anyone have an explanation for this or recommend anything I can do. Thank you.