Is there a reason why your feeding live? Are you going to breed them? With live you do get the full nutritional value from the rat BUT its dangerous in many ways rats do carry certain types of diseases where just freezing them kills it off and also of your higher end morphs or even a normal that you care about you are running the risk of your snake getting bit.... If your snake were to get bit on the head or the neck area you most likley will have an infected wound on your snake which is hard to get rid of and not to mention he/she will stop eating...