Mortality in last three days - yoke not absorbed

Laurelm

Songster
10 Years
Jul 14, 2009
258
7
123
San Diego County
I have been hatching a lot of chicks lately but from time to time they die in the last 3 days. When I open up the egg I can clearly see that the fully formed chick did not absorb the yoke.

What would cause this to happen?

Thank you.
 

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