My humidity dropped to 30 this morning in the incubator. That was quick because I just added water to the trays a couple days ago. Well at least I thought it was a couple days ago. It's back up to 40 now.
What do you all keep your incubator humidity at for your turkey eggs? Anyone go higher than 40? Anyone go lower than 40?
I usually dry incubate until lock down; unless the air cells increase to quickly, at which point I will add water. I trace the air cell with pencil and keep track of the expansion about every 4 days or so. If the humidity is lower than 30% and I see a large increase in the air cells, I add water and bring humidity up to the mid-40's.
Once I am ready for lock down, I move the eggs out of the forced air units and into the still air styrofoam bator where I hatch. Through much experimentation, I have found I have much less trouble with shrink wrapped babies without the fan.
When setting the incubator up, I place a couple layers of paper towels in the bottom (covering the entire bottom) under the wire. On top of the wire I put a layer of the foam shelf liner stuff: It is easier on the newborn's feet and makes cleaning a breeze.
Then, directly under the vent hole, I have a tall square glass dish (was part of a storage container set) that I fill with water. I keep a small funnel in that vent all the time, so filling it is easy and I don't spill water. I never seem to need the second plug in this particular incubator anyway.
To keep the humidity up where I want it, I use ankle socks with excessive holes and cut them into 1/2 strips from toe to ankle hem. I wet the strip then put it in the dish, leaving the hem corner hanging out a bit to create a wick effect. This slowly drips water onto the paper towels below. If I position the dish right, it will be over the tray areas in the bottom of the bator so it doesn't make a mess and weep water out the bottom.
During lock down, I keep the humidity higher than 65%, typically closer to the high 80's. So far, I have had 100% hatches of both the chicken and turkey eggs I have put in the bator this year: A total of 35 chicks and 7 (almost 8..one is pipped) turkey poults. Also, this seems to be the best system for hatching goose eggs (with the addition of misting and daily cool offs after the first week). Last year, I had much better results after I started using this combination: Every egg that made it to lock down hatched.
Good luck everyone.