I have a flock of 11 1 roo 10 hens I'm going to get three knew day old chicks when do I put them with my flock and will the flock be upset will they not like me any more will the roo be mean to the knews ones will the flock be mean will they ever like them is it alright to get more I don't want my flock to not like them and when I get day old chicks from a hatcherer and I say I want a girl chick will it be a roo