oh you’re right, forgot cows don’t produce milk when they didn’t just give birth. To be honest I just assumed cows gave milk since chickens are shown giving eggs, but there’s no mention about cows afai-remember.

OK looked it up so there is an instance where you see a cow milk factory. They push them drugs to increase their production (not a legal business kinda slavery-ish). It’s possible some others rely on recently pregnant cows to donate some extra milk, or maybe it’s more common to go with soy, almond, oat, etc.