I refuse to breed mice. I've met people who do and been to facilities where they are bred and they stink, stank, stunk! Rats smell better than mice, but ASF's I can breed in my home without worrying about the strong odor. Contrary to what some people experience, my ASFs rarely bite. I've raised rats before and prefer the smaller size of the ASFs (they don't out grow ball pythons) and the lower odor levels.