I get sick when i smell rats, its just something about it that makes me get headaches and want to puke Mice on the other hand have been great, they smell more but when rats smell its alot stronger. Ive tryed breeding rats twice and got nothing, but mice have been great. I will never try ASFS, Unless you breed just for pet snakes it will be a pain trying to sell baby snakes stuck on ASFs to people who have little or no access to them.