I am having trouble understanding an ongoing problem I am dealing with one of my roosters. He has been housed with 6 hens of different ages since last October. He has just now started showing intetest in acting like a rooster should but everytime he mounts a selective hen she and most everyone else in the pen turns on him and chases him away. What can be done? He is an Ameraucana and hens are Barred Rock, Orpington, Maran and EEs.