I have 13 hens and a rooster. They are about 5 years old. I'm going to be replacing the hens soon and I'm wondering if I should keep the same rooster or replace him too. I can get a rooster that is being raised with the hens that are coming. But I'm wondering if it would be a good idea to keep my current rooster because he is familiar with the perimeters of the property. Any advise?