Hi, I have been lurking around for the past couple of weeks. I started incubation of 48 eggs on Sunday evening, 4/9/17. It is an older still air incubator, it didn't even come with a temp or humidity gauge. I bought a thermometer that lays on top of the eggs (and verified its accuracy with other thermometers). I also bought a reptile humidity gauge (and verified it's accuracy with and electronic humidity monitor we had). Out of those 48, we have 38 definite ones with chicks!
Humidity has been around 40-45%. I haven't added any water, we are keeping it in our basement.
1. As incubation goes by....do the chickens put off more heat? It seems like I am constantly having to turn down the temp everytime I go to turn (I am turning 3 times a day). Sometimes it will sneak up to 102, I am trying to keep it right around 100. I am worried about about this!
2. I am doing my last turn tonight and will go on lockdown. I have read anywhere from increasing the humidity to 65-80%. Recommended? The only way I can get water in there without opening it is too add it through a small vent hole. Is there a humidity percentage that is too high that I need to open up other vent holes??
3. Temperature - My temperature gauge is the type that sits on top of the eggs that has the plastic backing. I want to keep monitoring this temp but if those eggs hatch first I won't be able too. I do have some fake ceramic eggs (we used it for some chickens we had bought that had problems pecking at their eggs, fake eggs immediately stopped it!). Since these fake ones are the same size....could i put the gauge on top of those or will it not work because they are ceramic and not the real thing?
4. I would like to put something down on the metal grid to catch all the little shell pieces, I read somewhere to use cheesecloth but I was worried about their little feet getting stuck on it and wrapping them up so I was going to put the cheese cloth under the metal grid. Or could I just use paper towels?
Thanks!!
First, still air incubators need to be 101-102F with the temps taken at the tops of the eggs. If it has been running on average of 100F, don't be surprised if the hatch is slightly delayed. Yes, the closer you get to lock down the more heat the chicks put off themselves. Heat will also rise if humidity drops. People who have thermostat controlled bators don't see this because the bator adjusts. Those of us without digital control have to adjust for this ourselves.
Yes hatch humidity needs to be at least 65%. I am a hands on hatcher, I use 75% it often shoots up to 80+ during hatch. Hatch humidity does not compromise the hatch unless it is too low and allows the membranes of pipped chicks to dry out. Chicks drown if the incubation humidity (over the first 17 days) is too high preventing the egg from loosing enough moisture and not allowing the air cell to grow. However, you don't want to see condensation on the inside of the bator. If you are going to be hands off and not open the bator at hatch you can easily use 65%.
You can lay the thermometer on the screen at lockdown. Yes, it will reflect a slight difference, but many people opt to lower temps a degree or two at hatch, in your case, I would not.
I use the rubber shelf liner available at most dollar stores on my grate. It cushions the eggs and provides a good footing for new chicks. I've used it for almost three years and highly recommend it. I'll add a pic for reference.
I will post in that thread...I also just read that someone put their eggs in cartons during lockdown to keep the air sacs upward because they were small?
Yes, if you have significantly small air cells, hatching upright in cutdown cartons is best. It helps prevent excess fluids from traveling into the internal pip where the chick can aspirate on it, as well as generally keeping it away from the beak at hatch. The cartons should be the cardboard not styrofoam and should have a circle cut out of each individual cup where the egg sits to allow for air circulation. If you find you are having trouble once hatch starts, feel free to join us on the hands on hatching and help thread, or at anytime.

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