Out of six chickens(I was told they were all hens), three turned out to be roos. I can't have roos in my county. I haven't been able to give them away and now they've started crowing. I'm trying to hold off but I think the neighbors are taken notice. If I get a noise complaint then my whole flock is at jeopardy. They were born 3-21-11. When can I cull?