Is your younger roo about a year old? He is just hitting a maturity that makes a challenge to the established roo a possibility. This is normal behavior. Personally I usually let my boys work it out on their own. A fight is going to cause a few ruffled feathers and even a bit of blood. Things I watch for that would cause me to interfere would be a roo that is clearly losing, but will not retreat, or a winning roo who will not allow a defeated roo to retreat. It is normal for them to scuffle off and on for a few days.
In my experience after less than a week the scuffling stops. Sometimes the older roo continues to reign, but on occasion the younger roo is over the older in the pecking order. Older hens tend to still follow the older roo either way.
In my experience after less than a week the scuffling stops. Sometimes the older roo continues to reign, but on occasion the younger roo is over the older in the pecking order. Older hens tend to still follow the older roo either way.