rats are higher in protein and fat than mice are. They are about 12 % higher in protein so if you have a lets say a 1000 gm snake that would place food items at about the 100gm mark. A 100 gm rat would have the same amount of crude protein and 112 gm of adult mice. I think that is what you are asking the bigger thing is an adult mouse is what one third the size of an adult rat likely less than that so it is one rat to three or more mice.
references...
http://www.nal.usda.gov/awic/zoo/Who...nal02May29.pdf
hope this helps
alex
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