This past spring, we added 6 chicks to our existing flock of 4-year-old Rhode Island Red hens. Two of the chicks turned out to be roosters. Now that the roosters are full size, they are constantly "herding" only the older Reds into the henhouse. They are great with the hens they were raised with, and also with each other. However, I am having to let the older Reds free range at different times from the others to insure they get outside time. Is there anything I can do to curtail this ungentlemanly behavior, or is this common? The 2 roosters are Jersey Giants. Thanks for any advice.