The Poultry Health & Hatching Forum

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high humidity during incubation

Hi all.
Looking for some help. During hatching season I run two poly hatches and Brinsea 190 & 380. It is mallard ducks I am hatching and am having very poor hatch rates. I cannot get the humidity down in my cabinets as the humidity in the ambient air around them in my garage stays up around 60%. Has anyone any tips or suggestions on how to resolve this. I ran a Dehumidifier close to last hatch but no improvement. I dont add any water to incubators until eggs start to pip and vents open fully until lockdown for hatching.

Monday, August 31st, 2020

Hi, I haven't been on here in a while. I built an incubator recently and I'm testing it at the moment to see how it runs. Having no issues with temperature control but what I'm finding re RH may help you.

The ambient RH where I'm testing is about 60%. I'm finding that the RH inside the incubator with no water added is about 35%, adding a wet sponge brings it up to about 45%.

I'm currently running a test with the entire bottom covered in water to see if I can bring up the RH to between 60 and 70% for the lock down stage. I'm finding that it's only reaching 51%, now this could be a problem which I have to resolve.

Based on what I'm seeing above I don't think the 60% ambient RH would be an issue.

Monday, October 5th, 2020

The humidity inside the room is something while the humidity inside the incubator is something else that is because of temperature difference, you need to control the humidity in the incubators.

Monday, October 5th, 2020

Yes, basically an incubator will be pulling in ambient air through its vent at room temp (About 20deg - or lower in a garage). Once it's heated to 37.5deg C it's capable of holding more moisture so the 'relative' humidity will be less. To what extent it would drop I wouldn't have understood, but based on the test results I'm seeing above, 60% RH ambient air wouldn't be a problem.

Tuesday, October 6th, 2020

I came across some info last night specifically about incubating duck eggs. In the case of both Hens and Ducks the mother will leave the nest to look for food and water once a day. This means that the eggs will cool down temporarily. While it's not thought to be important to try and emulate this for chicken eggs it seems that as a duck will have to swim in the process when she comes back her feathers will be wet. It seems that mother nature accounts for this additional moisture so it is necessary to spray duck eggs lightly with cold water once a day to ensure that they don't dry out too much (I didn't pick up on the exact details of what days etc that this should be done)

Wednesday, October 7th, 2020

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