My grandfather had a dairy farm for 40 years. I would spend a month or more during the summer when I was a kid to help haul hay (and a lot of playing in the country). This would have been late 70's and early 80's. When we needed milk for cereal, we just got it out of the tank. I drank that for years until me and lactose had a disagreement. When my older brothers went out there, he would also kill and butcher his own beef.