Once a roo has been successfully caponized it will not be aggressive to other males, it will not crow, will be much more docile, these are very good things if you want a pet roo and live in town. On the eating side, they are able to be processed at a much older age and still be tender, so for those who want to hatch thier own eggs to eat and not deal w/ massive crowing, and aggression of a bachlor pad, and want to give thier roos time enough to get to a good eating size w/o it being so tough it needs to be slow cooked.