Thanks, yes, I really think a lot of aggression is genetic...plus, you can't always blame the owner for the cockerel's behavior! I've even had a hatchery hen randomly go people aggressive one day (a barred rock, believe it or not) and she just got worse and worse until she would walk around you pecking and making your feet and ankles bleed any time she saw flesh as she waited for you to bend over so she could jump and go for your eyes. She was given a few weeks of terrorizing people and then she was culled. OUCH. I'm less patient now. It hurts less.
Plus, if you're going to be bringing warm water to your birds several times a day in the winter they'd better at least be polite.
Haha yes, except for the winter part... southern Calif here...
When I had 100+ peafowl, I needed quite a lot of broody hens to hatch their eggs(notorious for being harder to hatch in incubators plus my dander allergies).. the hens needed to be mellow enough to let me handle the eggs and chicks under them. Nest warriors and screamers/runners were no good at all as they risk damage to the eggs and chicks during their fits. That was a big factor into my habit of testing every bird for aggression when handled and it really made a difference in 'developing' lines of very mellow and excellent setters. It was really nice to lift a hen and check on the eggs without getting pecked or even screeched at... especially with sometimes 50+ setting hens at once lol