The essence of the synchronization is the reduction of hatching window to a minimum, so that the main mass of the chicks hatched in the same time just before picking them up from the cabin. For this at 19 days of incubation it is necessary to open the flap of the machine and the fresh air is forced to enter, and CO2 level at the same time lowers to the level of 0.2%. Thus there are created favourable conditions for a longer stay in the egg for the embryo. In this mode, the egg is incubated for 24 hours. Then, at 20 day of incubation, the damper is closed, CO2 level raises to 0.55% and the chicks begin to hatch intensively. The hatcher is set up so that the flap is entirely dependent on CO2 level, so than higher is CO2 level, the more opens the valve and more air goes into the cabinet. As a result of hatching synchronization process it was possible to mention that the time of first appearance of chicks was 19 days and 12 hours in the experimental group and 19 days and 22 hours in the control group from the beginning of incubation period.