All my ferrets get a constant supply of dry food (mix of lots of brands) and 1 potion of meat in the summer and 2 portions of meat in the winter. I give them a mix of whole carcasses (rabbits, pigeons, partridge, pheasant - why do they always eat the heads first!?) plus cheaps cuts and scraps from the butchers (chicken joints, chicken liver, lamb ribs, beef mince etc). I also give egg yolks, oil and fish as treats.