The document provides facts about dairy cattle and milk consumption. It states that the average human drinks 25 gallons of milk per year, which is equal to 400 glasses. Dairy cattle were first brought to North America in 1642. Cows produce milk after giving birth to a calf and are milked twice daily by machine every 12 hours. Nearly all dairy cattle in the US, weighing 1,300 to 1,500 pounds on average, produce around 18,000 pounds of milk over 305 days.