You've answered my main concern. If you had been feeding the rodents live, I would have worried quite a lot (somewhat dependent on the size of your rabbits).
I ahve to admit to a weakness here, though. While one animal hunting another in the "wild" is something I accept - and with cats who have access to the outside it is hardly an unknown experience - I wouldn't cope with breeding for food. But I confess to be able to bond with almost anything - give me time and I could probably make friends with a cockroach!!!! Bit weird really for someone to whom it is not an unknown experience to find a whole lamb's liver left in a bag on the front seat of her car!