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3

Certainly one factor you don't mention is simple variation between samples. The bacteria count after pasteurization may depend on the bacterial load before, and there are lactobacilli strains more heat tolerant than others. And then there is post-pasteurization contamination. The best-before date is a conservative estimate for these things as well. If your milk was processed first after the daily sterilization you may be in luck; the bbd is assuming it's the last batch ;-).
– Peter - Reinstate Monica
Commented Jun 9, 2021 at 9:37
13

"and from the environment (that is, bacteria in your fridge)" Maybe I'm doing it wrong, but I always (1) open the fridge, (2) take the milk carton from the fridge, (3) close the fridge, (4) open the milk carton, (5) pour out the amount of milk I intend to consume, (6) close the milk carton's screw cap, (7) open the fridge, (8) put the milk carton back into the fridge and (9) close the fridge. How would bacteria in the fridge enter the milk container? Or, in other words, why would I open my milk jug/carton inside the fridge?
– Heinzi
Commented Jun 9, 2021 at 11:01
14

@Heinzi The bacteria in your fridge coat the lid and the outside of the jug and when you do your open and close routine there is some probability of them migrating a bit. It's why for some kinds of lab work you'd sterilize the outside of the container before opening it.
– Perkins
Commented Jun 9, 2021 at 19:45
1

@WhiteHotLoveTiger That's interestingly the most environment-friendly packaging, even though it is plastic, because of the little mass involved. Glass production, transport cost and cleaning make even deposit bottles worse, iirc. These plastic bags have been improved so they stand on their own, and there's some mineral filler in it to reduce the carbon footprint, by a company called Ecolean. Pretty neat.
– Peter - Reinstate Monica
Commented Jun 10, 2021 at 13:54
1

AFAICT, both kinds of dates mean the same thing, and they're equally untrustworthy.
– FuzzyChef
Commented Jun 11, 2021 at 1:25

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