Got a constant food source in there, like biscuits? Then you can top it up with the more "meaty" stuff as normal. Ferrets have a short digestive system, so little, alot is the general rule, but leaving meat in there can become smelly, so that's why I have biscuits, then take the biscuits out when you put a leg of rabbit or a few livers in there, then just place the biscuits back. Throw in some extra protein and crack two or three eggs on top of the biscuits. Makes the biscuits softer and also, the stinkers go mad for it!
If it's not a food problem, then make sure the hobs aren't fighting o