Another question, is it safe to mix chicks that haven't been vaccinated with Mareks with chicks that have?
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I have an eternal shrink wrapping problem, I don't even hesitate to help hatch now, if I didn't assist shrink wrapped eggs I would have only hatched less then 10 of the over 100 I have hatched. The eggs have shrink wrapped for me w/ 100% humidity outside and condensation in the incubator. If the eggs have shrink wrapped your choice is to help or let them die, they CAN NOT HATCH from a shrink wrapped egg.
How can I recognize a shrink wraped egg?
With mine I go by hatching progress. I know I have a huge problem with it so if I see the eggs stall for a set amount of time, absolutely no progress, I assume shrink wrapped. (I have lots of experience w/ this so for me it is more a feeling) I bring my incubator into the bathroom and shut the doors, turn on the heater and the hot water in the shower, get it hot and steamy, then check the egg furthest along. (the incubator is opened for a second or two to get the egg out and only after the bathroom is hot and steamy) I open the pip hole enough to look inside. Shrink wrapping is very obvious, the outer membrane is white and just like the word implies, shrunk and stuck to the chick tight and very dry. Before you start to open the egg, candle it (and any others you try) b/c shrink wrapping has a very obvious look in a candled egg that is hard to describe but once you have seen it a few times you will recognize it. If one is shrink wrapped (in my case anyway) they are all shrink wrapped. Any that aren't hatched by that point I "birth" in my hot steamy bathroom w/ q-tips and warm water. My success rate w/ external pips is near 100%, about 75 % w/ internal pips, and dismal w/ no internal pip.
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It's the internal membrane of the shell that sticks, not the yolk specifically...
It's the internal membrane of the shell that sticks, not the yolk specifically...
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That is my understanding... The humidity keeps the membrane pliable and soft so they can get through, and if after they pip the membrane dries out (if humidity is not high enough) they can't get through, and the membrane can stick to them. You have to help them out.
At least that's my simplistic of explaining it (to the degree I understand the nuances... I'm new to hatching.)
- Ant Farm
So if I got it right shrink wrapping is happening when humidity is low and then yolk sticks to the shells making chicks unable to move and hatch. Even thought you described it very good, I can't visualise it, just like you said, I need to see it in person. And that steamed and hot bathroom is great idea. I would never think of that.
So I heard about internal and external pip, but I don't know what it is and would be grateful if somebody explained that to me. Lot of articles talk about it and I can't understand them because of that. Thanks
Does shrink wrapping happen with broodies or isbthat more of a incubator thing?
I think shrink wrapping is an incubator phenomena, -not sure if it is seen with broodies.
Low humidity during Incubation, (as well as opening the bator during lockdown) contributes to it, and makes the chick sticky so that it has a hard time rotating and hatching.