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The relative humidity in the incubator between setting and three days prior to hatching should remain at 58-60% or 84-86 degree F., wet-bulb. When hatching, the humidity is increased to 65% relative humidity or more.An excellent method to determine correct humidity is to candle the eggs at various stages of incubation. The normal size of the air cell after 7, 14, and 18 days of incubation for a chicken egg is shown.or still-air incubators, add 2-3 degrees F. 2 Measured as degrees F. using a wet-bulb thermometer. Use chart to convert to relative humidity. Sanitation In large commercial incubators, eggs of different ages are often set and each setting transferred to a separate unit prior to hatching.
Store eggs for hatching at 55 degrees F and a relative humidity of 75 percent. Eggs stored longer than 2 weeks may decline in hatchability. If stored more than a week, turn eggs daily to prevent yolks from sticking to shells. Incubation. Muscovy ducks require 35 days of incubation; eggs of other domestic duck breeds require 28 days. A chicken hen or female duck can set on 9 to 11 duck eggs. Place the nest where it won't be disturbed during the incubation period and provide a convenient source of feed and water. The nest should be checked at hatching time.