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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Milk spoiling in your fridge is caused by the fact that bacteria gave entered it and started to colonize it. Even when pasteurized little bacteria remains and will eventually start to spoil the milk. Inside the animal those bacteria are actively fought by the animals immune system and the immune cells in the milk. That’s why mother’s milk is good for infants. The immune cells within the milk itself keep any bacteria at bay for a developing immune system.
Now the milk within the animal will eventually break down if not consumed. As it does it is reabsorbed by the body. If that happens enough the body will send out a hormone signal telling the animal to stop producing milk. This is why cows need milked regularly or they’ll “dry up”…well that and the breeding done that makes them produce more milk than is comfortable to have stored in their udder when full.
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