Only purpose of foid cattle' existence is to serve humans. This duty is fulfilled by total their total submission. Therefore, only characteristics of them that are necessary for it are useful ones. Their parts, that can even partially invalidate their duty are harmful for this goal, and should be treated as such. Both their eyes and vocal cords aren't needed for submission of them. Moreover, by their eyes they get a chance to be hypergamous more precisely and by their vocal cords they get ability to speak, which also lead to higher hypergamy by them communicating with each other.
