Close, kinda, the shell gland is the uterus.
See the clown who started this thread now has us making ridiculous mammalian and avian connections. SMH. :lol:
America Test Kitchen tested a half dozen packaged stock/broths.
They are very thorough with lab testing.
Only one had any chicken products in it at all...and it was very little.
I can't remember all the details, you could probably find the show online,
but there are many other compounds that...
Better ones like this, obviously BS that becomes fun humor,
than the ones where someone other than the OP(who has a serious topic/question) makes it all about them or their comedy crew. :gig