I bought 2 red sexlinks, and they started laying at 18 weeks. I have 30 other breeds (RIR, New Hampshire, buff orp, cochin, wyandottes, sussex, etc.) all 21 weeks and not a single egg from any of them!!! I am so frustrated!! My 2 older girls (who are now 30 weeks) are faithfully laying 1 egg/ day each! They even give me a double yolker every couple of weeks. Is there anything I can do to prompt them? The older girls never had a roo around until I got the new bunch of chickens, so could it be because of the roos? I always thought they would prompt the girls to lay (btw, the 3 boys are 21 weeks too) I hate being patient, but I'm about to threaten to turn them into chicken dinner!