Jen, not sure if you were referring to me, but I've held back offspring from my high white females and none of them have presented MC or gone on to have MC in their litters either. Nor have the ones that I've adopted out to pet homes.

I am always very watchful of my rats, as much as I am to my snakes - and if I had any concern about the health of the feeders I am producing, the female would immediately be pulled from my breeding stock and become a pet either in my home, or someone else's.