Sexing RIR and NH...ever notice the white dot on the wing span chick down??

[Lady of McCamley]

Surfing the web today reading on genetics and sexing chicks, I discovered this article from the University of Kentucky Ag Dept. that said Rhode Island Reds and New Hampshires can often be sexed as chicks because the males will have a white dot on the wing span. Not 100% accurate as the white dot can vary in size (and thus be missed????) And it is only in the chick down and is lost when the feathers come in, so only works with the young chicks.

Anyway, is that something you've noticed? Experienced?

I plan to add some more New Hampshires again in the future, and if that is true...I will totally be looking at little wing spans of chicks (which side of the wing span do you think? Top?).

Here's the article. Good sexing information...just wondering if it is accurate.
http://www2.ca.uky.edu/smallflocks/Factsheets/Sexing_day_old_chicks.pdf
Page 2, about half way done, 2nd paragraph in left column

Just curious
Lady of McCamley