Just a question

One thing im pretty certain of is you take a well fed, well taken care food item and you freeze it, something is lost. How much experience do you have feeding live vs. frozen? I bred freeder mice for about ten years. It wasnt until about a year ago that the bulk of their diet was frozen because i simply dont have the space anymore. I see a difference in my animals that had the majority of live prey vs. frozen. I just had a friend over recently and said "look, these were fed live and these were fed frozen" they saw a difference too. If i can do some research and figure out vitamins are lost i can put just lost vitamins back. I bred garter snakes for 10 years or so but had to use vitamin b cuz they eat fish.