Originally Posted by ellpel
102.5f? Instructions on incubator say 99.5 even with out fan . Should I put mine higher ?
I typoed, it's actually best to set the temp to 101.5-102 degrees on top of the eggs, so you are aiming for 99.5-100 degrees at the center of the egg. 102.5 I stated in my original reply is a little high, (sorry sorry sorry, I really despise still air incubation and never use it because there's too much variation in temps all around inside the incubator!)
Still air incubation temp is typically just measured with the included thermometer laying on top of the eggs, and since the egg yolks are in the middle of the egg, the temp there is going to be at least a couple degrees cooler, since warm air rises.
The incubator instructions included with still air incubators that tell you to set your temp at 99.5 degrees are instructions that were written under the assumption that people will buy the fan kit separately and install it before setting eggs. (I really wish they'd correct that, it would save a lot of keets and a lot of heart ache for people that use them and are unaware of the temp requirements being so different and end up with such poor hatches).
Do a little research online, I promise you that the still air incubation temps need to be higher than cirulated air temps. Still air incubation hatches generally take a couple days longer to hatch, have much lower hatch success rates, as well as more keets with leg and genetic issues if set to 99.5 degrees
Here's a good link, that explains still air vs circulated air: http://msucares.com/poultry/reproductions/poultry_temp.html
Edited by PeepsCA - 4/10/12 at 9:10am