ive had a few baby bp's that would not start on mice or rats and got them going on asf hoping they wouldnt stick to them as the myth says and after a few meals they all switched easily. ive noticed that my bps that have had asfs tend to go back and forth more easily. When i am low on mice ill feed and asf or rat pink/fuzz. if im out of small rats ill feed a nice sized asf. they go back and forth really easily.
Although asf's dont grow as fast as rats from my experience. i can have two litters of rats before a litter of asf's lol.