I was wondering if it was really bad to let different breeds mate and make new babies? I have a 2 RIR hens..i think are hens..lol, 1 Buff Orpington hen, 2 Buff Orpington roos, 1 Plymouth Rock hen, 1 mix hen?, 1 Australorp hen, 4 Ameraucana or Ancona's hen mixes..was told they lay green eggs.. I don't remember what he said they were, and 2 Brahmas. I just want to know if they breed with my 2 roos it its OK. Or is there like a CHICKEN CODE and they shouldn't mix. Please let me know. Thanks