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With the different stages of embryonic development, the embryo has different requirements for the outside temperature. In the early stage of incubation, the metabolism of embryos is in a low-grade stage, which produces less body heat and therefore requires a higher incubation temperature. At the end of incubation, with the development of the embryo, the metabolism of the material is increasing, and the embryo itself produces a large amount of body heat. Slightly lower temperature. However, a hatching temperature standard cannot be used to ensure the hatching rate of the hatching eggs. For example, compared to big eggs and small eggs, the influence of receiving temperature of large eggs in the early stage of hatching is slower than that of small eggs. In the later stage, the heat dissipation performance of large eggs is worse than that of small eggs.
Artificial hatching usually has two modes: constant temperature incubation and variable temperature incubation.
1. Constant temperature incubation. In the same incubator, when there are batches of embryos of different incubation ages, incubation is performed at a constant temperature (37.8°C) which is constant temperature incubation. Incubator hatches should be incubated at constant temperature.
2. Temperature incubation. Variable temperature incubation is also called multi-stage incubation. Different incubation temperatures are applied according to different ambient temperatures, hatching models, different types of eggs, and different ages of poultry embryos. Only a single batch of hatching eggs in the incubator can be incubated at varying temperatures according to the temperature required at each stage of the embryo. The incubation temperature is greatly affected by natural conditions such as the season and climate. Therefore, the temperature of the incubator should be higher when the indoor temperature is low, and the temperature of the incubator should be lower when the indoor temperature is high. In the late fall, winter and early spring temperatures should be maintained at equilibrium, preferably maintained at about 27 to 30 °C. Generally, when the egg source is relatively abundant and the hatching machine is filled at one time, incubation with a variable temperature is more ideal. Box-type incubators generally use variable-temperature incubation.
The advantages of variable temperature incubation can be gradually adjusted according to the embryo and development conditions, which is conducive to embryonic development.
The hatching duck eggs have certain developmental characteristics every day. This characteristic can clearly be seen before the stronger light. According to the characteristics of the embryonic development, the proper incubation temperature is given for its normal development. "Temperature" technology, skilled in grasping the day-to-day development characteristics of duck embryos, can accurately determine the number of days of incubation, and thus adjust the incubation temperature according to the number of incubation days.
Duck artificial incubation temperature conditions
The primary condition for fetal development must be strictly and correctly grasped. Because only at a suitable incubation temperature can ensure the activity of various enzymes in the eggs and the normal metabolism of the embryos, so as to ensure the normal embryonic growth and development. The developing embryo is most sensitive to the change of the external environment temperature. Only at a suitable temperature can the embryo develop normally and hatch on time. Under normal circumstances, the incubation temperature is kept at 37.8°C and the hatching temperature is about 36.9°C, which is the proper temperature of the embryo. Excessively high or too low temperatures can affect the development of embryos and, in severe cases, cause embryonic death. Generally speaking, the temperature is high, the embryo develops quickly, but it is very weak, and the temperature exceeds 42°C. After 2 to 3 hours, the embryos die. On the contrary, when the temperature is too low, the growth of the embryos is retarded. The temperature is as low as 23°C. After 30 hours, the embryos are All will die. The specific temperature should depend on the variety, egg weight, embryo age, growth conditions, temperature, and practical experience.