I practically completely dry incubate here in FL in the summer. I fill the water chamber up once when setting eggs, this evaporates in about 4 days. When they go in lock down I bump it up to 50% or so.These discussions are alwasy so interesting to me; I believe it has a ton to do with what altitude you're in. I've tried incubating at lower humidity as Ernie mentions above, and I always get sticky chicks, to the point that some can't even hatch (and I am a firm believe in not helping, so it's awful to open up an egg to try and find out what happened and see that the chick was simply stuck & couldn't get out).
I'm in Michigan; I run my humidity at 40-45 through day 19, and then increase it to 65. After hatching thousands of chicks, and experimenting with the humidity levels, this seems to work best for me.
I think once you find out what seems to work for your area, just keep doing it the same way.
In the winter, when its drier and we have the heat running at night in the house: I fill up the water channels when I first put eggs in and then one more time halfway through incubation that's it. On lock down I bump it up again to around 50%. I do the same with all the varieties of chicken eggs. I agree it depends on your humidity, temp, altitude and on your individual incubator too.
Get cheap eggs to start with and experiment with what works.
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