are you feeding f/t or p/k?

Temperature seems to be the biggest issue with getting snakes to take f/t items. Last time I fed my bp a f/t rat she didn't seem interested in it. I was like UM NO you are supposed to be a good eater...so I left the rat under her heat lamp for about 10 mins or so, right underneath so it was almost hot to the touch....I threw it in the box and WHAM.