Back when I was breeding mice for my snakes I bought some white and fancy mice from Petco and kept them in the same room as my rats, and they never would breed, so I figured it was true. I figured the mice WERE scared of rats so they would breed.
Now I know its not true. I now breed pet ONLY fancy mice that I got from PetsMart. All three of my females got pregnant when I put them all in with the male figuring they wouldn't breed anyway. These mice where of course also in the same room and actually the same modified closet and nearly 50 rats.
Therefor, I am sure its just your mice that won't breed and has nothing to do with being in the same room as rats.
Danyelle
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Danyelle and the Wonderful rats of CinnaRat Rattery.
Ivan-Russian Blue Self Rex
Mayhem-Russian Blue Self Dumbo
Landon-Russian Blue Rex Dumbo
Azzy-Russian Blue Rex Dumbo
Ravyn-Black Irish Rex Dumbo
Rave-Black Irish Rex Dumbo
Branwen-Black Irish Rex Dumbo
Bran-Black Self Rex Dumbo
Midnight-Black Self Dumbo
Kitte-Black Berkshire Dumbo
Flea-Black Berkshire Dumbo
Annikka-PEW Rex Dumbo
Brite-Himalayan Rex Dumbo
Molly-Himalayan Dumbo
Keiko-Fawn Self Dumbo
Rozzy-Fawn Berkshire Rex Dumbo
Brooke-Beige Variberk Dumbo
Lily-Platinum Hairless Dumbo
Angel-PEW Rex Dumbo
Misfit-Black Berkshire Rex Dumbo
Mischief-Black Variberk Rex Dumbo
Charlotte-Opal Self Dumbo
Hayden-Opal Variberk Rex Dumbo
Nokia-Opal Berkshire Rex Dumbo
Estrella-Beige Irish Dumbo
Dylan-Blue-Fawn Blazed Berkshire Rex Dumbo
Orion-Beige Variberk Dumbo
Zara-Black Irish Rex Dumbo
Emma-Platinum Blazed Berkshire Rex Dumbo
Hannah-Platinum Irish Dumbo