I ended up with 26 out of 40 eggs hatching and I'm a little disappointed. It is my first hatch, but everything went so perfectly throughout incubation, I was hoping for better results. I am a bit concerned that it may have been the opening of the incubator that screwed things up. I had two zip and then die in their shells after opening the bator and removing the first batch of chicks. However, I only opened it a crack and the temp and humidity did not drop much at all, so maybe that wasn't the problem?
I've got 14 more eggs due to hatch tomorrow. It was a staggered hatch. These eggs were shipped from Stromberg's, not local, so I'm not as hopeful for a good hatch, but still keeping my fingers crossed.
100 / 40 = 2.5 x 26 = 65%
Your 65% hatch rate does not sound bad from what I have heard of "rumor wise" about shipped eggs. Also, getting the eggs right now means they were artificially stimulated into breeding and egg production which is to say that the unnatural breeding season may produce less fertility or less breeding. I have read that artificial stimulated birds do not breed as vigorously and the eggs them self are not as dependable/viable. For that reason I never tried it and just wait for their natural occurrence,
Heck for that matter, you might have got some of the first runs of the season. Even with my birds eggs (no shipping) and waiting for natural breeding season to occur... the first runs were always seem to have low fertility counts. so I started waiting until about 2 weeks later before collecting and incubation.The chicks seemed to be more healthy as and I have good hatch rates.
Opening the door:
If they zipped and died in the shell I am guessing they made the half or full circle but never pushed/broke out. I have seen that a few times as well and have simply whipped out the exacto knife and helped them out...."
Due to that rumor you always hear about shrink wrapping if you open the door and let the humidity out".
Shrink wrapping was NEVER the case!
They all seem to be weaklings for some reason. I have kept those I help separate and most times they were the ones that die out within a few days.
If you think about the shrink wrap rumor, your original question and the chick inside the egg..."
that chick is Wet when it hatches" so that membrane is going to stay wet for some time and opening the door for a minute or two is not going to dry it out and kill that chick.
The membrane is like a tissue paper (latex as I call it) when wet and more paper leather when dry. However, if the chick inside the egg is wet, there is no way the membrane is going to fully dry out so much the chick cannot break out, especially if it zipped.
Even if the membrane did dry out a little due to the door being open, as soon as you shut the door and the humidity starts to come back up, the membrane will rejuvenate to a degree as the humidity regains. So I would bet it was just weak chicks destined for doom.
So far I have hatched about 10,000 eggs altogether so it becomes a "hatch a lot loose a few" attitude for me and I understand others concerns. But in saying that I dont know it all or carry that mind set. But I do feel a lot of folks over think the natural process of incubation and think it needs to be an exact science with no deviations allowed.That does not happen in the wild, Nature is always throwing in curve-ball factors and exceptions.
Congrats on the hatch....now you will become an egg addict like the rest of us.