Must agree with this! I started out with my snakes eating mice and tried breeding them for a bit. They definitely smell quite a bit. Once my last litters were born I couldn't wait to switch to rats. I currently have about 13 rats ranging from weanlings to fully grown(not counting the new born pups), and they don't smell nearly as much as a few mice even with regular cleaning. Also rats are so much better parents than my mice were. Good luck with them though.
Just read your post again, and gotta say you only want one male with your females at a time. I've had feeders get into some nasty fights when I put them into the holding tank before feeding them out.