My late '08 normal female is still on the small side. She had a RI and mites in the past, which may of delayed her growth. She's a good eater and easily takes f/t weekly. I'd like to switch her over from mice to rats asap as I need to make an order soon. My question is, what size/amount should I get?

I'm thinking she could handle 1 rat pup weekly?...and ordering 50 of those..or should I start smaller? (these are from www.themousefactory.com)

Weight: 204 grams