Quote: I wonder if the early crowing might be an indication of high testosterone and increased likelihood of aggressive behavior patterns later?
My original mixed breed roo was a very early crower--before 6 weeks. Although a good flock-protector, he was somewhat of a jerk and not very gentle with the ladies.
We rehomed him to a family that needed the flock protection and kept his son. This son is very well mannered and respectful to everyone including the dog but still vigilant for predators. He didn't crow until he was about 18 to 20 weeks old.
It would be interesting if other folks could report on their roosters: how early they crowed and if they are prone to aggression or jerkish behavior. If there was a trend that the younger they are when they crow correlates to how aggressive they turn out, then it would help with some of the early decisions to cull. My chickens must have a good nature. I wont tolerate a jerk, no matter how handsome he is.