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8. Adjust the humidity levels in the incubator. Humidity should be around 45 to 50 percent throughout incubation, except during the last three days when you will want to raise it to 65 percent. You may need higher or lower humidity levels depending on the type of eggs you wish to hatch.. Record the day and how many eggs you've incubated on a calendar. You should be able to estimate your hatch date based on average incubation times for the bird species you want to hatch. For example, chicken eggs typically take 21 days to hatch, whereas many duck varieties and peafowl may take 28 days.
1 At the time of transfer, the temperature of the hatcher should be set at 37.2Â°C (99Â°F) and the humidity set at 65% (88Â°F wet bulb). 2  As the hatch progresses, and eggs begin to pip, increase the humidity to 80% (93Â°F wet bulb), and increase ventilation openings by about 50%. As the hatch nears completion gradually lower the temperature and humidity so that by the end of the hatch the temperature is at 36.1Â°C (97Â°F), and the humidity is at 70% (90Â°F wet bulb). 2  Vents should be opened to their maximum setting by the end of the hatch.