Because the rooster is a male animal, the male reproductive system of the rooster has no ovulating ovary and related glands that form egg white, egg shell membrane and egg shell, so it can't produce eggs like hens.

Hens lay eggs from 16 weeks old to the expected date of delivery, and can reach the peak of laying eggs at 25 weeks old. A hen lays about 300 eggs annually on average. There are fertilized eggs and unfertilized eggs. If the hen successfully mates with the cock before laying eggs, and the cock's semen is combined with the egg in the hen, the hen will lay fertilized eggs, and the fertilized eggs can hatch chicks.

Extended data

The source of hens' eggs:

The ancestors of birds are reptiles, and reptiles also have the ability to lay unfertilized eggs. The ancestors of reptiles are amphibians, and the ancestors of amphibians are fish from water, and they all have the ability to give birth to unfertilized eggs.

Giving birth to unfertilized eggs is not fatal to the survival of birds, but sometimes it is beneficial. For example, ostriches will lay unfertilized eggs at the edge of the nest, which can dilute the probability of fertilized eggs being preyed by natural enemies, so as to achieve the purpose of protecting the fertilized eggs in the middle from hatching successfully.

The trait of laying eggs has been preserved in the long process of evolution. In the wild environment, the activities of male and female birds are synchronized, and the fertilized eggs of eggs reach more than 90%, while chickens domesticated by humans can give birth to unfertilized eggs.

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