When I was a kid we milked the cows (gurneys). We had three, but maybe 1-1/2 milking art a time.
A gallon of milk would yield a quart of cream which we skimmed off to make butter. We called it skim milk... I am sure we didn’t get 98% of the butter fat.
whole milk today has less butter fat.
The very reason I switched to Half&Half.