I have occasionally crossed father and daughter, they were okay and crosses like that can set traits in a line like blue eyes or a certain color. From what I understand not every poll to poll breeding will produce a hermaphrodite, and some say it's not proven, but it's what I've always read...
Polled to polled breeding can produce hermaphrodites, so it's not recommended to breed the two. I am no expert in genetics so I can't comment on what colors will be thrown. From my past breeding it did seem like polled was dominant, and blue eyes were recessive, but I could be totally wrong...