Pretty sure I was looking at a scientific paper where they showed their was virtually difference between mice and rats nutritionally. Just rats are more convenient for larger meals /snakes .
They didn't involve underdeveloped pinkies or hoppers ..
I'll try and find it online somehow - as I always presumed rats were far better ...
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Rats are around 56% protein and 32% fat and 12% "ash weight" mice are around 46% protein and 38% fat with 16 percent ash weight. As for minerals and vitamins virtually no difference. In any case it's not that big of a difference.