Question on the Mount

What has bothered me the most about The Mount is figuring out what statement the novel is trying to make. Is the novel focusing on the master/slave relationship or the superior relationship humans have to animals? Or is it about something else entirely such as race or sex relations? It seems to me that the book touches on all these issues. Is there one issue, Ms. Emshwiller, that you really focused on the most or do you want the reader to decide for him/herself?