I just read your thread on Big Girl. Very interesting.
On the DNA testing the issue of only showing the predominant sex was why I suggested feather shafts from a couple of different areas.
Blood will only show the predominant sex (though both may be present) but I believe a feather shaft will...
What an interesting thread thank you for starting it and the explanation of the different types as well as the article @Perris posted are fascinating.
I think you should reach out to the authors of the articles and publish something here.
Anything you write will be much improved if you had...