Hatching question

Clay In Iowa

Songster
11 Years
Oct 9, 2008
663
10
141
Near Wilton Iowa
What causes chicks to give up between day 18 and hatch??

FYI
Incubation conditions day 1-18: 99.5 degrees +/- 0.2, Humidity 44% +/- 2% only auto turner.

Hatching conditions day 18-21+ 99.5 degrees +/- 0.3, humidity 64% +/- 3%.

I have 2 digital thermometers in each, the incubator and hatcher, and they have 24 hr high/low. The temps and humidity never varied for the above conditions and usually hovered around the middle of the reported temp and humidity.

I put 4 very active Ameraucanas in the hatcher on day 18. Today, day 23, I have one chick. I don't understand what could have gone wrong.
 

Ryu

Songster
11 Years
Jan 6, 2009
617
2
139
I always go by wet bulb readings. 84-86 degrees wet bulb for incubating, 90-91 for hatching.

Looks like you are at about 81 degrees for incubating and 88.5 for hatching, that could be the cause for late hatch/late quitters.

How big are the air cells on day 18?

Most of my experience has been with still air incubators, but we have a Brinsea Ova easy that is forced air, and it seems like the wet bulb readings hold true with it.

Were they shipped eggs?
 

Ryu

Songster
11 Years
Jan 6, 2009
617
2
139
Where is Wilton to Iowa City?

ETA: You're pretty close to me. I work at the U of I. My sis has a black Roo on Wheaton based Ameraucana hens (offspring would be black). One hen is laying a nice big blue egg (roo is from blue only line so eggs would be blue from this cross). I'm getting 100% hatch from this hen right now, I could ask if I could collect some for you.
 
Last edited:

Ryu

Songster
11 Years
Jan 6, 2009
617
2
139
Let me know if you want me to try to get the eggs posted above for you.

Good luck hatching!
 

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