Generally, in the early stage of hatching, the material metabolism of the embryo is in a low-level stage, and the production of heat is less and the temperature should be slightly higher, which can stimulate the metabolism of the carbohydrate and promote the development of the embryo.
In the middle of the incubation period, the metabolism of the material gradually increases and becomes more complicated. The embryo increases and can generate a part of its own heat. The temperature of the external supply should be slightly lower than the previous period.
In the late stage of hatching, fat metabolism is in an exuberant stage, and a large amount of heat generated by the embryo itself will be emitted. If the outside temperature is too high, it will hinder the emission of heat, and toxic products in the body will not be discharged, resulting in embryo poisoning or boring of dead bodies. Therefore, the temperature in the later period should be low, but it should be increased slightly when it is out of the shell, so that the shell can be neat and tidy.
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