my hens are about 3 years old and I have introduced a rooster to the flock a few weeks ago. The thing is, my hens terrorize him(especially when he try's to jump on them). Also he has only crowed a few times, i think this is because he was not the dominate rooster in his old flock. How can i help him to be a dominate rooster? how to teach my hens to be nice?