I have read a few threads about the integration of hens to a flock but my situation is a little bit more complicated and I was curious if there were others out there who have dealt with this. I have posted similar in the past without any solid answer so excuse me if you've read this problem and I'm repeating myself. I currently have 12 chickens, 11 hens and 1 rooster. They turn 20 weeks old on Tuesday. My rooster is a barred rock and he's been great, sometimes he gets a little physical with the hens but he's never attacked me or my family and is very protective of his hens. This is the part where it gets tricky, I have 15 more chickens on the way but they will arrive 6 weeks apart. This means there will be a time where I'll have 3 different sets of differently aged chickens. I've heard you shouldn't introduce chickens until they are nearly full-grown. They say sexing of chickens is 90% or so and if I get 15 hens I'm thinking I have pretty good odds of getting one more rooster, if not more. Will I ever be able to introduce my roosters to each other or will their age differences make them impossible to integrate? I have a couple ideas. I was thinking of building some kind of chicken tractor I could put the new ones in while my regular flock free ranges... with the idea being they would kind of see each other around and not be startled at a new chicken in the flock. Another thing I was wondering about was integration of the 2 sets of baby chicks that come 6 weeks apart. Is it worth building a brooder with a wire divider down the middle so the week old baby chicks can see the six week old chicks or would I inevitably just have to try and re-integrate them again at a later point when they were nearly full grown? I really would like a second rooster, hopefully no more than three and I'm open to any ideas you may have on peacefully integrating them to my flock. I know it can be very dependent on the rooster and it's breed but according to mypetchicken all the breeds I got were supposedly friendly and docile, none were labeled as aggressive. Also my current rooster is well mannered. Well thanks in advance! edit: Completely forgot the roostern ratio. I will have around 30-35 chickens by next Spring and was curious what you guys feel the maximum roosters I should have is.