My first BP will not take a f/t even after her yearly winter fast (4 mos.) ended last week. I've had her two years and have tried the switch a few times. I held out giving her a live one for a couple of extra weeks to entice her to switch, but she wasn't having it. My second BP takes them no problem without even striking and constricting. It seems to really depend from snake to snake. I guess the new method for conversion is "Tough Love", but I settled for feeding two small live ones.