Found a couple links to recent studies on nutritional composition of prey items. In each case, if you want to go straight to the tables with the information, they can be found at the end of each paper.

Good Luck

Nutrient Composition of Whole Vertebrate Prey

www.rodentpro.com/qpage_articles_03.asp

Nutritional Aspects of Insects as Food

nagonline.net/Technical Papers/NAGFS00397Insects-JONIFEB24,2002MODIFIED.pdf