I guess the first question is, does milk spoil when it is still inside the animal and if not, why does that not happen? Like cow milk. If I don’t milk that cow for a week, the milk wouldn’t spoil, right? But if I put a jug of pasteurized milk out in the environment, it would spoil, right?
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Spoilage is caused by microbes such as mold and bacteria. The animal has an immune system to fight off these microbes. Once the milk leaves the body, there’s nothing to protect against the microbes anymore.
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