I was going to wait til they were older, but due to unforseen circumstances, I'm putting a dozen 9 week old (all pullets I think) in with my 6 month old bachelor roo in his very large run and 6x8 coop. The roo has always been very docile, but has never had a lot of chickens around him because until now, he's lived only with another bachelor roo his whole life (6 months). btw - not sure if it makes a difference, but these are bantams. The roo is a tiny d'uccle, but still a lot bigger than them. The 9-week olds are different bantam breeds: brahmas, wyandottes, barred rocks, sebrights, easter eggers. What can I expect with this introduction? Will the roo recognize them as youngsters and not hurt them nor try to mate them? Will he happily share his run and coop with them? Does anyone have experience introducing pullets this young to a single roo? I'm hoping he will be happy to have them with him, but I don't know what to expect.