I have a 2 yr old roo and my flock is down to 5 hens. He is pretty big has become aggressive when it comes to mating and I was wondering if I should replace him with one of the new cockerels from a recent hatch. I will have at least 12 hens total but 7 of them are only 8 weeks old now but the other 5 are a little more than a year old. Any suggestions?