Birds cannot be persuaded to accept new birds. You can introduce a rooster to a flock of hens, no problem. You can introduce several roosters that have been raised together into an existing flock of layers. I have done this several times before without fights, and I will be introducing three 5 month old roosters to live with my 7 layers in about a week, after butchering 11 of their brothers. You can combine two flocks of hens if you rebuild the flock one at a time to create a new flock.
You do this any other way and birds can kill each other. It really helps to do some reading on this site, because that's where I learned this.
I have never had problems introducing any variety or number of birds to my flock, be them roosters or hens... I believe a lot of aggression towards new birds is caused by lack of space and/or places they can seclude themselves in the coop or run...
For me I just sneak the new birds out at night and put them on the roost, come morning there is a little "What the bleep, who is that?" curiosity but that is short as they all are more interested in running to get food and water...
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