I had an extremely aggressive rooster. I came here for advice and was warned multiple times to not allow him to reproduce as aggressive tendencies are in the genes. Since I certainly didn’t want to be responsible for more mean roosters I never hatched any eggs. He passed away in January and I somehow ended up accepting a cockerel, no, two cockerels from a friend. I’m still thinking I’m dreaming. These guys, who are now roosters, are lovely, gentle, sweet gentlemen. I allowed eggs to be hatched under a broody mama and now have 5 cockerels that are currently coming into 15 weeks old. Not one has shown signs of aggression. Yes they are young still but good roosters get invited to the dinner table while still young! I know! I’m going to be forced to begin to invite these lovely boys to my Sunday dinners in a week and a half! Not being meat birds they take a bit longer to grow for decent meat. Slaughter is between 16-20 weeks. There’s no time to let them grow up and see how they act over time. No testing time. And it breaks my heart because it’s more than likely, due to genes, that these guys would be those elusive good roosters!
And something I believe is helpful is to get a young cockerel for a flock of matured hens. Those ladies will put that boy in his place if he’s rude. They will teach him manners in short order. He’ll be dancing for his ladies amusement in no time.
Meet the father of the young cockerel you are considering. Don’t introduce a young cockerel until your hens are a couple of months older than one year. You’ll stand a good chance of getting a good rooster.
And with that I leave you with this. I’m in Warren County NJ. I’ll be eating chicken Sunday dinners unless someone wants to stop me