A chicken egg gets fertilized when a hen and a rooster mate. The rooster transfers his sperm to the hen’s oviduct, where it can stay for several weeks. The hen produces eggs in her ovaries, and when an egg is released, it travels through the oviduct and meets the sperm. This is when fertilization occurs. The fertilized egg then forms a protective shell and is laid by the hen. An egg that is not fertilized by a rooster will not develop into a chicken
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