Not the document I mentioned, but some interesting items, including the calcium thing:
http://books.google.com/books?id=n4sXQbXYPOAC&pg=PA150&lpg=PA150&dq=nutritional value chicks vs. rodents&source=bl&ots=pUBk4T-5le&sig=6KxWsPdXJc2Yxem5e3aiasI1-zE&hl=en&sa=X&ei=FFEDVJWJBoPLgwSzv4CYAg&ved=0CDEQ6AEwBzgK#v=onepage&q=nutritional value chicks vs. rodents&f=false

I'm pretty sure that a varied diet will be the best regimen, as it is in human beings. I can't quite bring myself to freeze WC garter, water and other snakes though, and I'm afraid of parasites from live fish, snakes, lizards. Then there's that cryptosporidiosis thing....