First off, I'm not completely new to having chickens, as I've had my roo & hen for almost a year. But that's just the thing, until today, it's been only those 2, plus 2 female Pekin ducks. My rooster is a Brown Leghorn, and he's a good boy. No human aggression whatsoever. He's not what I would call "aggressive" with my ducks, but he will kind of boss them if they try to boss my hen. The environment my flock lives in is a big fenced in backyard where they free range during the day, with a dog kennel & igloo that they roost in at night. That being said, I got a new cockerel & pullet today. They're Barred Rocks, approx 6 months old, and so far appear to be very docile. We thought it would be a good idea to keep the newbies in the pen by themselves for a few days, like we did with our 1st chickens, to acclimate them. Well, when the leghorn noticed that there were new chickens, he flipped his wig. He was clucking & carrying on, kept circling the perimeter of the pen and was all puffed up. He eventually chilled out. He wasn't alone, the hen was checking them out pretty heavily as well. So, how long should I keep the existing chickens separated from the newbies? Also, I'm going to remove my Leghorn's spurs later tonight, just in case. Do y'all think this will work out? Any suggestions to help make this as smooth as possible?