" My friend in US says they buy big bottles of milk and use it over weeks. I'm from India and we buy milk in pouches. It gets stale in 2-3 days. How does milk in US stays fresh for weeks? "
Then an Engineer who designs Dairy Equipment and has specifically studied milk distribution in India showed up on the thread and he explained the difference between milk storage in the US & India. Here is the Answer:-
The vast majority of Indian milk distribution is usually carried out at "ambient temperature" meaning it isn't cooled in any way, and isn't distributed in pouches.
Usually, it takes about 4 hours for milk to be transported to your doodhwallas (milk delivery people), who then add water to it, and sell it on to their customers. Average time for milk to go from cow to the customers is 6 hours. By most dairy standards, this milk is already unfit for human consumption.
Customers in India usually know that their milk is mixed with water, and are happy about it because the day's milk is boiled before each use. At the end of the day in the average household, the last bit of milk has been boiled about 4-5 times. It's used to make paneer and ghee
By this time, the milk has a slightly burned/sugary taste, and is a little brown in color.
The milk that IS distributed in pouches only counts for about 15% of milk in India. From experience, I can tell you that finding a "clean" dairy is rare (the cleaning chemicals are not cheap), and that the pasteurization process used isn't always as good as it can be. Also... the distribution of the pasteurised packs is Ambient temperature again. This gives the milk a good head-start on the way to "going off".
At this point, It is important to understand what Pasteurization does.... it kills active bacteria - stuff that damages the milk, and eventually takes over the milk causing it to "spoil" and "go off". Taste is important too. Pasturised milk tastes very like milk from a cow. Approximately 10% of Indian milk is buffalo milk. This stuff is hard to deal with, and the pasteurization process is less reliable. Pasteurization does NOT kill the bacterial spores. These are like bacteria "seeds", and will produce more bacteria if the conditions are right. In India, the conditions are nearly always right.
The alternative is UHT treatment. "Ultra High Temperature" pasteurization is a very precise process that isn't used much at all in India, mostly because it "tastes wrong" and is very very white. both the color and taste are not trusted by the average Indian. If you tell someone that the milk will last in the package "for over a year" they usually assume that there are nasty chemicals in it.
UHT treatment - very importantly - kills the spores. If you then put your milk in the right kind of container, it will last for a very very long time.
For Indian customers, Taste is very important. Also, Tradition is very important. You have a trusted doodhwalla, you're going to get your milk from him. Daily.
IF you're a your "new generation" Indian, chances are you buy your milk in a plastic pouch and put it in the fridge. The problem is, your pasturised milk has already had plenty of opportunities for the spores to produce bacteria, and your pouched milk is a ticking clock.
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