I look for a cockerel that the pullets and hens respect and like; one that also conforms to my needs in his offspring. I look for a wide pelvic space for him to pass those genetics to his daughters for ease of egg laying and a meaty chest to pass those genetics to his sons for my dining pleasure. I reject a cockerel that shows any aggression towards me or my dogs, or a cockerel that is unnecessarily mean to his brothers. Around here, a bully today is likely to be brunch tomorrow.