Good grief!! Why on earth would anyone want to use an aggressive rooster for breeding? So he can produce aggressive offspring? That rooster should have been made into soup instead of being made into a sire..Our rooster started acting that way at a year old. It got so bad that we made the decision to give him away to a local farm that doesn't kill and wanted him for breeding. He was biting me, my kids, and ripping apart my hens. He came close to taking out one of my hens eyes and I was afraid that would happen to one of my kids. Nothing hurts worse than getting attacked by an angry rooster with spurs! I've had roosters that were very gentle. I think if they feel that they need to be defensive for whatever reason they will be. Mine was a Sultan and He had limited visibility because of his crown of feathers. I would give him a pony tail to help him, clip them, trim his leg feathers, - he was a miserable ROO. Good Luck!
His offspring won't necessarily be aggressive. It depends on what he transmits to his offspring. Temperament has a strong hereditary component.
