Cows have four stomachs. The food has to go through all four stomachs before it is fully digested. When they eat the grass it goes down through the four stomachs and down to the udder. Then the cows are brought up to the shed and they get milked. The milk from the cow goes into the cups. But some countries still milk by hand. The milking cups only take around five minutes to milk a cow.
Once the cows have finished every night a tanker comes and collects the milk and takes it to the factory where it is pasteurized. That means it’s turned hot and then cold very quick. That kills the germs.
Then the milk is bottled. The others are processed – cheese, butter, yoghurt and ice-cream.
Dairy products are very useful because it keeps us alive.