I have a 6 ft. female that I adopted. She is probably 4 or 5 years old and has multiple spine deformities (which is probably why she won't get much bigger). Anyway, she takes a large rat---also bought from Rodentpro---every two weeks. Her foster mom was the one that told me to keep her on this schedule, and, as this woman has fifty or so of her own boas, I trust her judgement. Hope this helps...