Sorry, but my mouse-eating breeders gained their weight back plus some incredibly quickly. I had 2 2000g+ girls lay 6 and 7 eggs respectively, in late May to early June. Babies hatched late July, early August. One female is already breeding again, the other female is going to a friend of mine.

So yeah.. Rats or Mice, whichever is more convenient for you and whatever the snakes readily eat, is what you should feed. They both do the job just fine.