My bp lost his strike enthusiasm late winter and early this Spring, but he also would take F/T rats if left in the tank. I've recently been using a temp gun to make sure f/t prey are warmed to about 100 degrees F before offering. He's also graduated to and is taking rat weanlings/smalls now. Someone else in a related thread I posted suggested strike vigor is a function of prey size/prey temperature, and my snake seems to have confirmed that observation. (The "strike" is back in force)