http://youtube.com/watch?v=PRuqaWgQsG0

I hope i copy/pasted that youtube clip correctly.

So here i am this morning, watching snake stuff on youtube, and i came across this educational clip i tried to paste at the top.
:20 into the clip, the guy says
"Usually we suggest large mice to feed them as opposed to rats. Some people feed frozen. But remember, freezing kills thiamin, an important B vitamin, so feeding frozen all the time is not good unless you have a good vitamin supplementation."

I searched online trying to find more information about this claim that freezing destroys Thiamin. All i was able to find was a bunch of information about feeding garter snakes fish that have a lot of Thiaminase, an enzyme that destroys thiamin (vitamin B1)

I've heard this argument before that somehow F/T rodents are inferior to fresh killed or live rodents. Usually i just ignore it as being from a mis-informed, gore-loving person who believed something blindly instead of gathering more information before trying to regurgitate bad information to somebody else who might not know better. That's why i'm a little more concerned about this clip. It seemed to be an educational clip on how to care for ball pythons.

Anyways, what im asking for is any information that freezing rodents somehow reduces, destroys or alters the nutritional value. Any experiences or opinions are welcome, however i'm looking for specific information on what exactly happens to reduce the nutritional value of F/T rodents.

Also, I may be mistaken about this, but i thought that it was better to get snakes onto rats rather than leaving them on bigger and bigger mice because rats have less fat content. Like i said, i read something like that a while ago, i may be wrong.

Thanks,
Tony