I usually freeze my rabs for at least 10 days before defrosting them (fully) before I feed them to the ferts. The freezing process kills any germs, bugs etc they might have which could be passed on to the ferts. However, when they hunt in the wild, they will catch fresh, guts in, and all quarry so it's a bit of a toss up. Do your best! HTH. Cheers, D.