If milk goes bad after sitting out of the fridge for 2 hours, how does it stay “good” inside cow’s bodies where it’s 38°C?

Question

If milk goes bad after sitting out of the fridge for 2 hours, how does it stay “good” inside cow’s bodies where it’s 38°C?

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Answer 1

Same reason any other living thing (and their bodily fluids) don’t get microorganisms growing in them; they have immune systems keeping them out.