I raise mine up with chicks until they are old enough to go out into a brooder, then I 'll separate them, but i do not keep them with adult chickens as adult chickens can carry diseases that are harmful to peafowl, especially peachicks and can be aggressive to peachicks. Mine free range together, but are housed separately. Once adults you may be able to get away with keeping them together, but there is always that risk. Some people have no trouble keeping them together, others do. It can be an expensive lesson if it happens , so personally I try to avoid it. I also keep all my fowl wormed well to help prevent these occurrences.