At what humidity does the air sac start taking on water? And how can you tell if the chick has pipped internally? I have 3 eggs on day 22 while 2 of them hatched on the 20th. I know if the humidity is too high the air sac can be filled with water. I candled the 3 late eggs and their sirsacs are clear nothing dark in them.. but is there anyway to tell if there is water in them? I know that after the second chick hatched the humidity was up to 80% and I don't know for how long but there was quite a bit of condensation of the windows
Usually the problem with water in the air sack occurs during incubation. Many people do dry incubation and do not have this problem. Most do not really need to add water during the incubation period unless the humidity is down to around 20% then it is a good idea to bring it up a little. The eggs need to loose a certain amount of moisture during incubation and if the humidity is to high then the chicks will drown when they pip an air sack with water in it.
I do dry incubation and swear by it! So is there a chance that if it was up 80% for a couple hour it might have condensation in the air sac?
I don't think that your humidity was off. Many websites about hatching suggest 80% humidity during lockdown. condensation in the air sac usually is from during the incubation period of having high humidity then when you go into lockdown and the chick pips the air sac the condensation drowns the chick but not from the higher humidity during lockdown. I incubate at around 35% and when I go into lockdown I up the humidity to 65% to 75% and have not had many issues with hatching. My hatches are either 100% or very near. Usually all hatch. Once in a great while I might get 1 or 2 quitters. I did have a chick pip a few hatches ago and I went to do some errands. When I got home the chick hadn't progressed and I didn't notice any movement. I thought it might have shrink wrapped as I had heard of others shrink wrapping but when I took it out of the hatcher, I noticed it had expired. I did an eggtopsie and the chick was fully formed with the yolk absorbed and not stuck or overly wet so I couldn't figure out why it quit. I have had his happen in the past but rarely so I just chalk it up to it wasn't meant to be. I think that everyone who hatches has experienced something similar.