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Why is there no mouse flavour cat food?
(hexbear.net)
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I am not a mouseologist, but i would imagine that it's due to how difficult it is to get that meat divided by how much usable meat per mouse you actually get out of the process. There's a cooking term for this involving percentages but I'm pretty high and I cannot recall it for the life of me.
Bones and organ meat are good for cats though, and they can digest fur. Plus it's done for other animals- reptilinks for example makes rodent sausages for reptiles. So it's doable. I suspect it's more to do with cat preference