I just got 2 barrred rocks and 2 silver wyd I wanted to know if i can put them in with my 6 month olds ? The other ones are a little bit of a mixed breed but there are still pretty young and have been laying for a almost 2 months so there still young. would it be safe to introduce these guys in with the others ? they come from a reputable breeder and I know her flock very well and are not sick. help please !