Incorrect.You can't have an all rooster flock they will kill each other one after another
People keep flocks of entirely roosters all the time, whether it be they're raising them for meat production, or if they're just giving their breeder hens a break. I have a pen specifically for the boys when I don't want them harassing the hens.
ETA: You cannot do this with every breed, a lot of gamefowl will fight to the death if penned with other roos. But most breeds can and do mix well.
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