If you look a few posts down, you'll see a thread " Quit eating".
If you're burm is still actively feeding on rats, then I wouldn't hesitate to try switching over to rabbits. If he has a strong feeding response, the switch should be easy.
If your burm doesn't, maybe it might be best to wait until spring to make the switch.
After a winter of not eating, or diminished eating, your burm will be mighty hungry. A nice rabbit may be just the meal he wants.
This idea might be better than wasting a lot of food right now.
Though if you use fresh killed, you can wait a little while and see if he eats. If not, freeze the rabbit.
I'm not a big fan of live or fresh killed though.
And none of my snakes are either except an ornery western hognose that prefers p/k, but will eat f/t when the mood hits him.
So don't rush the switch. Give it a try, and then go full guns in the spring. Don't give up though, I've had some snakes that would go crazy for f/t rabbits, then want only XXL rats again, then not want the rats, and will eat only rabbits.

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