I have read a lot of information on how to introduce new birds to your established flock. Most of the articles and posts I've read seem aimed more at introducing and quarantining new pullets before adding them to the flock. My questions are: If you have an established flock, then you get some day old chicks and raise them in a brooder for over a month, do you still then need to quarantine them from your established flock for a month before you introduce them fully? Or can the introduction start right away since they've already been around for a month or so and separated from the established flock? Second question is about roosters: Lets say I have a flock of hens to begin with, and roosters are allowed in my area but I do not get one. If I change my mind later and decide to add a young or adult rooster to my flock, are the rules for introduction different than adding a new pullet? If I got a young roo or an adult, I'd obviously quarantine it for a month, just like with adding any other new adult or partially grown bird. Thank you in advance for answering!