[marklubi]

Haven't noticed that one. Oxidation perhaps, or maybe salt in the air based on the locations?

West coast food (particularly oysters) seems to be a little bit more salty/briny.

[PetitPrince]

What you feed your cattle change how their milk taste; where I live there's a noticeable different between summer (where cows graze on alpine meadows) and winter (hay) milk.