I just wanted to chime in and say that I raise mice, rats, and ASF. My breeders eat whatever I need to feed off and are always switching between the 3 prey types. I tend to keep snakes that are being sold on rats for the convenience of buyers. Out of about 60 breeder females and 20 breeder males, plus some holdbacks, I have one female who only takes ASF (I bought her as a problem feeder and paid accordingly) and 2 males that prefer mice but will take rats if they are hungry enough. So if you decide not to order F/T switching back and forth is a viable option most of the time.