Cold eggs at the later stage of hatching can improve the hatching rate of ducks and geese
Duck and goose eggs are large in size, small in surface area per unit weight, and their heat dissipation capacity is worse than that of chicken. Therefore, the eggs must be cooled during the second half of incubation. The specific methods are as follows:
When incubating with one incubator, open the door twice a day, take out 2/3 of the egg tray incubated for 18~24 days from the shelf, move the tray to hatching after 25 days, cool the eggs twice a day, and take out the egg tray at intervals. If the egg temperature is too high, take the egg tray out of the machine and put it into the machine. Generally, the time to cool eggs is 30-40 minutes each time, and the specific time depends on the actual situation.
When two incubators are used for incubation, incubate in machine A on the 1st to 15th day, the temperature is 37, 7 ℃, the humidity is 65%, and no cold eggs are needed; Incubate in machine B on the 16th to 26th day, with temperature of 37, 5 to 37, 7 degrees Celsius and humidity of 50%. Take out the egg tray regularly every day to cool the eggs outside the machine and spray water twice. After 26 days, move the eggs to the hatching tray of machine A.
In order to reduce the labor during egg cooling, after 16-17 days of incubation, the method of strengthening ventilation is adopted, which can not only discharge the excess heat in the egg, but also meet the needs of embryo ventilation.