drowning point?

Along with drowned partially hatched chicks I have found chicks who never broke the membrane and are surrounded by fluid so I do think it's possible for the excess water to kill them before pipping. I also have lost some in the middle of incubating when accidents happened that caused excessive water to get into the egg. It may not be drowning in the sense of breathing in water but what else do you call death by water?
 
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I have had one drown after it pipped. My guess would be that there was still so much fluid around the chick that when it pipped the fluid spilled into the air cell and when the chick took its first breath the fluid drowned it?

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Here's another question...Are the chicks lungs filled with fluid during incubation? I know human babies have amniotic fluid in their lungs, which I think is squeezed out during delivery allowing them to breath air. So what clears the chicks lungs for breathing? Is it possible that the mechanism for clearing their lungs fails and they drown simply because there is too much fluid in their lungs to breath?

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I've had humidity at 85% all through incubating and hatching and the had the best hatch I've ever had. It's different for different climates and elevations. Talk to local old-timers who have a lot of successful experience hatching. They will know for sure.
 
I had two drown this week.

I kept the humidity between 35-45% on days 1-17
45-55% on day 18 - and candled that morning - saw movement in all.
65-75% on days 19-21.

This was my first time, so next time I'll try keeping it 55-65% the last 3 days.
Or maybe 50-60%.
 

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