click the first sentence in that paragraph that refers to the Fred Hutchinson Cancer Center and their study. that's where this came from.
So basically they are saying that a woman can have male DNA once she's given birth to a son, or even if she was pregnant with a son and lost or aborted........I'm assuming it's because of the of the blood flow during the pregnancy. I know just enough about the chicken reproduction process to be dangerous, LOL I do know the yolk is fertilized inside the hen's body cavity, and then is wrapped in the shell. I don't know if that would necessarily give any or enough of the roosters DNA any time of actually 'mixing' with the hens blood/system to actually remain permanent in her body like this article suggests is possible with a woman who carries a child.
anyway, for those who thought me to be completely ignorant of how reproduction works, I promise I'm not. Maybe I just read a little more into what that article was saying than it really said