Purely speaking about humans (by no means do I know what I'm talking about in birds), ovaries and testes change with the introduction of the opposite hormone. Trans women stop producing semen and their dick often shrinks. Trans men frequently become infertile (like myself) with cessation of menstruation and our bodies attempt to grow male organs (max 3 inches). Pcos (highly common in the trans male community) is an example of a condition were females can present male secondary sex characteristics. That all being said, I know chicken scratch about birds hormones and can't say if any of that is actually relavent.
That is very interesting. I did not realise that about humans, because I have only looked at the bird side of things. Even though it is not about birds, I much appreciate your reply!
My quail has now had an avian sex test and he is male. I have also spoken to professors who have studied ornothology and my opinion can no longer be swayed. I am now a firm believer in sex change in birds.