Kids pour it on cereal every morning, but ask where milk actually comes from and you'll often hear "the store." Even kids who know it comes from cows usually don't know how it gets from the barn to the fridge. Here's the whole story in simple, honest steps you can share at home or in the classroom.
Why Does a Cow Make Milk?
A cow makes milk because she has had a calf. The milk is really meant for her baby – just like with people, cats or sheep. A calf grows inside its mother for about as long as a human baby does. You can color the two together in Cow with Calf.
On a dairy farm, a cow makes more milk than her calf can drink, and part of it goes to people. On many farms the calf is cared for in its own pen soon after birth and drinks milk from a bucket or bottle, like in Calf with Bottle. To keep making milk, a dairy cow has a calf again and again over the years.
What Does a Dairy Cow Eat?
Grass, hay, silage (grass or corn that's been packed and stored so it keeps), herbs and some grain – plus a lot of water. A cow's stomach has four compartments, and the biggest one is called the rumen. Cows chew their food twice: they bring it back up and chew it again slowly. This is called chewing the cud, and they spend many hours a day doing it.
Milking, Then and Now
Milk collects in the udder, which hangs under the cow's belly and has four teats. Most dairy cows are milked twice a day – every single day, holidays included.
Milking by Hand
Long ago, every cow was milked by hand. You wrap your hand around a teat and squeeze gently from top to bottom in a steady rhythm. It takes practice and strong hands. Some small farms still milk this way, especially with goats. See what it looks like in Milking the Cow.
Milking Machines and the Milking Parlor
Today most farms use milking machines. Cups fit over the teats and draw out the milk with gentle suction. To keep things moving, the cows walk into a milking parlor one group at a time – pictured in Milking Parlor.
The Milking Robot
Some farms have a milking robot. The cow walks in on her own whenever she's ready to be milked. Sensors find the teats and the robot attaches the cups by itself. Many cows get a small snack while they're in there.
From the Farm to the Dairy Plant
After milking, the milk flows through pipes into a big tank, where it's cooled right away to keep it fresh. A milk tanker truck (Milk Tanker) comes by regularly, pumps out the milk and drives it to the dairy plant.
At the plant, the milk is tested first. Then it's heated briefly to kill germs – that's called pasteurizing – and poured into jugs, cartons or bottles. From there it goes to stores and finally into your fridge.
What Is Made from Milk?
- Cream: the rich, fatty part that rises to the top.
- Butter: what you get when cream is churned or shaken long enough.
- Yogurt: milk that helpful bacteria thicken and make a little tangy while it's kept warm.
- Cheese: milk is thickened, the liquid (whey) is drained off, and the rest is pressed and often aged for a long time.
- Cottage cheese: a fresh, soft cheese many kids already know.
Cows aren't the only milk animals. Goats and sheep are milked too, and their milk becomes goat cheese and sheep's milk cheese, such as feta.
Try It: Shake Your Own Butter
A favorite activity for preschool and early elementary, and a perfect match for the coloring page Making Butter:
- Fill a clean jar with a screw-on lid about one-third full of cold heavy cream.
- Close the lid tightly.
- Take turns shaking hard. It takes a few minutes: first the cream gets thick like whipped cream, then suddenly a lump forms and separates from a thin liquid.
- Pour off the liquid (buttermilk), rinse the lump briefly in cold water – and you've made butter.
Wash hands first and check for milk allergies in the group. Spread it on crackers or bread so everyone can taste.
FAQ
Does every cow make milk?
No. A cow only makes milk after she has had a calf. Bulls and young cows that haven't had a calf yet don't make milk.
Does milking hurt the cow?
No, not when it's done properly. A full udder feels tight, and milking brings relief. Many cows head to the milking area on their own when it's time.
How can I show kids where milk comes from without a farm visit?
Put picture cards in order: cow with calf, milking, tanker truck, dairy plant, fridge. Making butter makes it real. For more about cows and their barnyard neighbors, read Farm Animals Explained for Kids.