When can I add them? They are in a temporary coop close to them.i just don’t want to get anyone sick or injured . I got two new young hens (about a year old) my rooster and old hen are the originals, she is a bossy loud dominant older gal and he is about a year old buff Cochin rooster. These new hens are amberlinks. Not very big. Should I worry about him hurting them during mating? He is light as a feather, because he is mostly feathers! My New Hampshire red hen weighs more than he does. He is very gentle and hardly ever mates. Just a big goofy scaredy cat.