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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.
You don't spritz the eggs and you keep temp and humidity the same during incubation. When you set them to hatch (lockdown) you'll need higher humidity, around 65%. But NOT during incubation, you just keep them wherever you keep your chicken eggs. Mallard ducks take about 26 days to hatch.Using the turner is fine.ave looked at info on this site on incubating duck eggs and still confused:: what humidity should i use? can i use the egg turner? do i spritz the eggs daily? what is the incubation period for mallard eggs? thanks. Reply. Reply. post #2 of 33. 3/19/11 at 9:04pm.