How did the chicken break out of its shell?

Under the care of the mother's [hen's] body temperature, the fertilized egg hatches from embryo to chicken in 2 1 day. After 2 1 day incubation, the eggshell became less sticky and more fragile after the hen kept turning, and the chick's beak was covered with a protective film. As long as the chicken pecks with its natural beak and is supported by its body, it can easily come into this world. After it hatches, the protective film on the chick's mouth should be removed, and some strong tea can be fed to the ground for food. It's best to feed brown rice first.