Can you please stay within the site guidelines when commenting on HN? Your last several comments have been breaking them in various ways.

https://news.ycombinator.com/newsguidelines.html

You probably wont regardless. milk itself wants to be drunk pretty quickly after being produced, and thus pretty close.

what changes is parts that arent so visible - milk powders, sugars, proteins, etc, that are inputs into ultraprocessed foods like a cheezit

It’s a cool story but one only has to go to Statistics Canada/Agri-food Canada to see exactly how much US milk is imported into Canada. Hint: it is substantially more than none.