well, I'm going with the brain / smell miss association link.
As I get older, I have this problem more and more.
I get a sent of sulfur and my brain says burning matches.
It fails to make the more logical association with the overly done hard boiled eggs I just ate and belched.
To those who are serious in this thread, this is what is happening.
Deer gutting does saturate your olfactory receptors, and they turn off.
(ever notice that if you are in a room and go out side, when you come back in...you suddenly notice the saturation smell of bacon that you weren't smelling when you left 10 seconds ago?)
Anyway, the fart smell, becomes now a echo of the deer smell, and you brain makes the miss-association.
It is real, but only to you.
IF I was standing in an elevator and you farted, I would not say "holy heck, you smell just like deer gutting" even though I know that distinctive smell very well.
It is a problem of scent saturation in your brain, and not any bacteria you are getting from the process.
If you plug your nose and put vapor rub under it while gutting, you will not have any problem with your farts subsequently.