We currently have a flock of 13 working to grow it larger. We have 3 roosters and 10 hens. I am noticing whenever a rooster tries to breed with a hen, the other hens attack him to make him get off her. Why are the hens so aggressive toward the rooster? Roosters are getting along right now, i know we will have to cull one or two soon, but the boys do not seem to be the problem in this situation.