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The bulk of my experience involves American game chickens. My family has kept them for generations (ours not birds) and until recently we had more roosters (cocks and stags) than many people have birds in total within a flock. Most of our adult males were confined individually in some...
Hatcheries may be only part of problem. Hyper-aggressiveness may be selected for in large multiple-rooster breeding flocks used by commerical hatcheries. I also get feeling many parties having issues with roosters expect to have issues with roosters.
Where are you folks getting your roosters? I have kept game roosters all my life and recently began keeping a good number of dominique roosters. Have yet to see this aggression business.