Roosters are flashier in color than hens because when the hen is nesting, the rooster will distract and fight the predator to keep the hens safe. So in nature roosters are supposed to fight and be brave.Roosters may sound an alarm call but, most will not stand and fight a predator, if they do, they would be killed quickly and no further use to the flock. If you want a rooster why not just pick the best one - one that is not aggressive to hens or humans?