Experimental study on the temperature at which eggs can hatch chicks

Incubation temperature: among the factors such as incubation temperature, humidity and ventilation, incubation temperature is particularly important, which is the first factor to determine the success or failure of incubation and the quality of incubation effect. A large number of experiments and production practices show that the artificial incubation temperature of chickens is about 37.8℃. However, according to the size, variety, environmental temperature and machine performance of eggs, the ideal incubation temperature will change to some extent, but the high temperature is not more than 38.5℃ and the low temperature is not less than 36.5℃. When discussing the incubation temperature, it is necessary to establish a basic viewpoint, that is, the ideal incubation temperature is to make the set incubation temperature as close as possible to 37.8℃ on the premise of meeting the cumulative incubation temperature (from the critical temperature to the incubation time). There are two common schemes for setting incubation temperature in production: constant temperature incubation and variable temperature incubation. Incubation in batches at variable temperature, when the ambient temperature is about 24℃, it is 38.2-38℃ for 1-5 days, 37.9-37.7℃ for 6- 13 days and 37.6-37.4℃ for18 days. In practice, we also need to regularly check the development of embryonic eggs as a reference for regulating temperature.

(2) Incubation humidity: The importance of incubation humidity is mainly reflected in the incubation stage. When hatching, the relative humidity should not be lower than 60% and kept at 65? 0? 2—70? 0? 2% is best. Higher humidity is good for chicks to peck their shells, while lower humidity will cause the phenomenon of sticky hair.

Knock out the chicken. The humidity in the incubation stage should be high before and low after, generally 60-55% before 6 days, and it can be kept at about 50% after 6 days. Because of the strong infiltration of damp heat, high humidity can increase the heat absorbed by embryos at the same temperature, which should be paid great attention to in practical production.

(3) Ventilation: Because a large number of eggs are concentrated in a relatively narrow space, the development of embryos needs a good air environment, so the electric incubators are equipped with large fans and air inlets and outlets. When using the electric incubator to hatch, we should have a basic view, that is, as long as the big fan of the incubator rotates normally, regardless of the size of the air inlet and outlet, as long as it is not closed, due to the negative pressure. Incubators will not be seriously deprived of oxygen. Many related books emphasize that the ventilation rate of incubators should be small in the early stage and large in the later stage. Of course, if the incubation temperature can be guaranteed, it is beneficial to embryo development. But sometimes we will encounter some special circumstances, such as severe winter and poor insulation conditions in the incubation hall. Large ventilation not only wastes electricity, sometimes even the set incubation temperature cannot be guaranteed, but the incubation effect is not ideal. According to the author's summary of many years' production practice, when the ambient temperature is low, the electric incubator is used for incubation. On the premise of ensuring the normal operation of the large fan, the incubation temperature should be guaranteed when considering the ventilation rate of incubation.

To sum up, incubation temperature, humidity and ventilation are mutually influential, but at the same time, * * * works together. Under the premise of grasping the first element of incubation, namely incubation temperature, taking into account humidity and ventilation, you will get ideal incubation effect under your conditions.