According to the characteristics of chicken embryo development, hatching has two key periods: 1 to 7 embryos and 18 to 21 embryos. In the hatching operation, it is necessary to create the hatching conditions suitable for the embryo development in both periods as much as possible.

1. Insulation in 1-7 embryos.

(1) The preheating of the eggs prior to hatching is beneficial to the awakening and rejuvenation of the chick embryos, and shortens the incubation time of the incubator. (2) From the first to the fifth day, the in and out holes of the incubator should all be closed. (3) Disinfecting eggs in incubators with formalin and potassium permanganate should be carried out after the surface of the eggshell has been condensated and dried, and embryonic eggs of 24-96 hours old embryos are avoided. (4) Do not treat eggs before 5 embryos so as not to drastically reduce the temperature of the incubator and egg surface. The entire batch of eggs should be performed after 5 embryos. When the egg is laid, the embryonic eggs with the small head up should be corrected. Because 60% of the embryo heads are in the small head, and the oyster shell cannot enter the air chamber for gas exchange, it will increase the embryo death and the weak hatching rate. (5) Increase the ambient temperature of the incubator. (6) Avoid prolonged power outages. In case of a power outage, in addition to raising the temperature of the incubator, heat water in the water tray.

2. Pay attention to ventilation at 18~21 embryo age.

During this period, the oxygen demand of embryos increased rapidly, and the temperature was very high, and along with shelling and hatching, the pathogenic microorganisms in the shell rapidly spread in the incubator. The ventilation and ventilation during this period should be sufficient and the following measures can be taken: (1) Avoid shifting at 18 embryos. It can be moved out of the embryo when it is 17 embryos (or even 15 to 16 embryos) or when it is extended to 19 embryos (about 10% of chicken embryos). (2) Increase the humidity in the clam shell and hatching and reduce the temperature at the same time. On the one hand to prevent breakage of the eggshell, the water in the egg evaporates faster, which is unfavorable for hatching; on the other hand, it prevents dehydration of the chicks, especially when the hatching is maintained for a long time. It is more important to increase the humidity. At the same time, hatching temperature of the hatcher should be reduced to avoid high temperature and high humidity. The hatcher temperature should generally not exceed 37.5°C during 19 to 21 embryo ages. 3) Pay attention to ventilation, if necessary, increase ventilation. (4) Ensure normal power supply. At this point, even a short power outage has a great influence on the hatching effect. In the event of a power outage, the emergency measures are: Open the door, turn the board upside down, and use a thermometer to measure the temperature of the egg. At this time, the temperature indicated by the door thermometer does not represent the temperature in the hatchery. (5) The choice of time for cubs. Generally, 60% to 70% of chicks are hatched, and when the fluff is dry, the chicks are bred for the first time. Prior to this, only empty shells were removed. After hatching, the unemerged embryos are collectively moved to the top of the hatcher for hatching. At the end of the game, you will pick up the youngster again and clean it. (6) Observe the window light. The chicks have phototaxis, and the hatched chicks will crowd to the front of the hatching dish, which is not conducive to the hatching of other embryonic eggs. Therefore, the observation window should be shaded to keep the hatched chicks quiet. (7) Prevent chick dehydration. Dehydration of chicks severely affects the survival rate and is irreversible. Therefore, chicks should not be kept in hatchers or chick processing rooms for a long time. They should be promptly sent to the brooding room or sent to the user.

If the breeder is healthy and nutritious and the eggs are properly managed, the embryo mortality outside the two critical periods is very low under normal hatch conditions. To understand whether the embryonic development is normal, eggs can be preserved at 10-11 embryos, if the chorioallantoic membrane "collapses", indicating that the embryonic development is normal in the first half of the incubation period; embryonic eggs of 17 embryos may also be smoked, such as embryonic egg heads. Sealing the door, indicating that the embryo is developing normally, all the proteins enter the amniotic cavity and are swallowed by the embryos.

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