why don't eggs sold in supermarkets hatch into chicks?

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As others have said the eggs have not been fertilized.

Secondly, a fertilized egg must be incubated at about 93 days for 21 days to produce a chick, so even if the eggs had been fertilized the refrigeration prevents the development of a chick.

NB It is not because of pasteurization. The eggs are not pasteurized, at least, not in the U.S. -- there are now pasteurized eggs on the market but that is, I believe, a single brand out of all the brands of egg sold (and it's only recently been introduced to the market)....Show more

The rooster must be present for an egg to be fertilized. Most eggs that you buy at the supermarket are from hens that are raised without a rooster being present. Roosters are not necessary at egg farms where eggs are produced for consumption. Eggs for incubation are grown at special farms called breeder farms where roosters are present with the hens....Show more

Because they aren't fertilized. They keep the Roosters out of the hen house.

Plus they're too cold. The hen has to sit on them.

BTW, Common Sense: Pasteurization is when you heat stuff up to kill bacteria. I think you got the milk and egg departments mixed up. Funny though....Show more

They have not been fertilized. A fertilized egg has a red speck in the yolk. But in general, eggs sold at stores should not have been fertilized....Show more

They aren't fertilized. Eggs have to be fertilized by a male before they can become chicks....Show more