（4） Turn the egg: The main function of turning the egg is to avoid the adhesion between the embryo and the egg membrane. The egg yolk is lighter than the protein, and the embryo
It is lighter than egg yolk. The embryo often contacts with the egg membrane. Turning the egg is to change the position of the egg, and the contact point between the embryo and the egg membrane also changes, thus avoiding the adhesion between the embryo and the egg membrane. Number of times to turn eggs: turn eggs every 90 minutes. After 17 days, there is no need to turn the eggs, and the eggs are moved to the hatching area.
