How do the people who work in Milk Producing Companies know when milk will spoil?

Question

as Seinfeld would say, do the cows tip them off :D?

Answer 1

They probably timed it, so every mild bottle/carton has a set amount of time. Although, its not always acurate, they sometimes put a date on it about 4-6 days before it goes off to protect themselves legally. (Im not saying drink milk after its use by date)

Answer 2

Are you basing this assumption on the expiration date they put on the carton?

Or is there more to it?

More info plz?

Ok I think thats what you mean going by the answer below.

Thats not controlled by the milk company. Thats controlled by the FDA.

They have a set date ie( let's say its 10 days for pasteurized) so the company puts 10 days from the day it was packaged ( with ultrapasteurized, same rule but the date is 4 or 5 times that of the pasteurized).

Milk companies are contolled by the FDA and DOA.