Temperature is the primary condition that determines the normal development of an embryo during hatching. Only when the temperature is suitable for the development of the embryo, can the eggs be hatched normally. If the temperature is too low, the metabolism of the embryo will be reduced, which will cause the embryo to stunt or stop development and eventually cause embryonic death. If the temperature is too high, the metabolism of the duck's embryo will be accelerated, the differentiation of the cells will be intensified, and the development period will be shortened, which may result in the death of a large number of embryos. At 42°C, duck embryos all died within 2 to 3 hours. It can be seen that temperature is the most critical factor in determining the hatching rate. During the actual incubation process, the heat generated by metabolism is significantly different due to the large differences in the metabolic intensity of embryos at different stages of development. Therefore, it is advisable to use variable-temperature incubation during hatching. At the beginning of incubation (1 to 5 days), the incubation temperature is 38.4 to 38.8°C; the incubation temperature at the middle of incubation (6 days to 5 days before hatching) is 37.8 to 38.2°C; and the hatching period (4 days before hatching) The incubation temperature of the chicks was 37.0-37.5°C. If the scale of production is small and the amount of eggs to be grown is small, it is not possible to fill the eggs in the hatchery at one time to carry out whole-machine hatching. At this point, the hatchery is usually equipped with 3 to 4 batches of eggs while hatching. In the case of multi-lot eggs in the hatchery, constant temperature incubation techniques are often used. When incubated at constant temperature, the suitable incubation temperature for the eggs is 37.8°C in the first to 24 days of incubation. In the later stage of incubation (25-28 days), the embryo develops and matures. At this time, it is not necessary to continue turning the egg. The egg needs to be transferred from the hatching machine to the hatching machine. This process is called landing, indicating that hatching has entered the hatching. period. During the hatching period, the incubation temperature should be maintained between 37.0 and 37.5°C.
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