How long til my roosters don't love each other? - Page 2
It depends on how aggressive the breed is, but generally around month 2 you might see cockerels begin to "shadow box" with one another without actually laying any blows. They begin establishing the pecking order since Day 1. By Month 3, they are "teenagers" and by Month 6+ you could expect them to start fighting.
The last picture is of my possible pullet, completely different tail feathers. But, they maybe that's the lowest rooster, of 4.