I hatched my first clutch of eggs this year and disappointed that 7 of them are cockerels and only 3 hens. Is there anything different I can do next year? Is this a fluke or pretty common? Also I am going to keep one for future hatching - any suggestion of how to determine which one to keep? Most aggressive vs least aggressive? Doesn't matter? They are 11 weeks old and I am going to process the others.