Since mice are mostly herbivores (they do eat insects and worms and stuff, but apart from that mostly grain, seeds and plants), I wouldn’t really expect them to

Since mice are mostly herbivores (they do eat insects and worms and stuff, but apart from that mostly grain, seeds and plants), I wouldn’t really expect them to thrive eating large quantities of an amino acid found mostly (in decently large quantities) in meats anyway… So don’t put too much stock in this being directly applicable to humans.