Has anyone every introduced new chicks (6 wk old or so) into an existing flock with a rooster? I'm not sure how my roo with handle it, he is fine with me but does protect his girls.
I have 2 roosters in my flock, and the older 25-week old roo (RIR) doesn't bother the newer chicks (both pullets and cockerels). I just put the newer birds in at night, after everyone's gone to bed for the night, and in the morning, everybody's good. I do have a cordoned off area of the chicken house though, that the younger birds stay in, until everyone gets acclimated to each other and the new environment. However, during the day, my younger 21-week old roo (black australorp) will grab my 9-week old birds and shake the bejesus out of them. Fortunately, I'm usually there to break it up and correct him. The 9-week old birds have adjusted to being with the older flock, and hang out with them, except at night... they'll hop into the cordoned-off area (it's open on top), and roost with the younger birds. I have 9-week olds, 6-week olds and 4-week olds that I have introduced in the last 4 weeks to the older flock (25-week old and 21-week old birds). Amazingly, my older roo just accepts them as part of the group, and makes sure that everyone is treated with respect.
My 2 roos don't even fight. Blackie, my black australorp, accepts his position as the secondary male in the flock, deferring to King Roo (I call him King Two-Feathers sometimes, because I had another rooster (golden Wyandotte) that was a mean son-of-a-b***h and ended up in freezer camp. I wasn't about to re-home him because of his aggression towards the other birds. But Goldie beat the crap out of King Roo, and he ended up with only two tail feathers left. He wears those two feathers proudly, though, and don't you dare touch them! LOL!) I know that his condition is only temporary, that when he molts for the first time, a year from now, his tail feathers will come back in and he'll be a gloriously looking bird. He is always keeping an eye on me, because he knows that I'm the actual ruler of the flock, and it seems that every time I pick up one of his girls to pet them, etc., (and most of them follow me around, asking for attention), he's gotta make sure that she knows who she belongs to, by immediately jumping on her and mating with her. They love him, though, and there are times when they'll put him in his place though.