You may want to give more information out. Especially since I'm assuming you posted about Kaa before and while I've never read that thread before because I was on leave that may be the case with others as well.
I have no idea how big your snake is, or the weight or the age.
Just a general idea, I will give hatchlings a rat pinkie once for the sole purpose to see if they eat f/t then a rat fuzzy to make sure again. Then after that they're eating rat pups.