What causes a chick to be dead in the shell?

[OkChickens]

I have a Gfq cabinet Incubator and seperate Hatcher they stay between 98 and 100 degrees. I am hatching out Welsummer eggs and about 1/2 when they go to the hatcher are dead in the shell in a few days? What can cause this? All that hatch out are fine... Thank you.

Nate

 

[ScissorChick]

It could be a few things...
Heres somthing I have saved to my computer. I copied it from somwhere, but forgot where.

Anyways take a look at it, and see if one of these could be the cause.

Not pipped. Full-term embryo, large yolk sac; yolk sac may not be fully enclosed by abdominal wall, may have residual albumen.

Causes:


Inadequate turning, resulting in decreased embryonic membrane development and nutrient absorption.
Humidity too high during incubation or after transfer.
Incubator temperature too low.
Hatcher temperature too high.
Eggs chilled (e.g., at transfer).
Nutritional deficiencies.
Heredity.
Embryological development accident.
Breeder diseases.
Inadequate ventilation.
Prolonged egg storage.

Pipped. Full-term embryo, dead in shell.

Causes:

Low humidity or temperature for a prolonged period.
Low humidity during hatching.
High temperature during hatching.
Nutritional deficiencies.
Breeder diseases.
Poor ventilation.
Inadequate turning during first 12 days.
Injury during transfer.
Prolonged egg storage.


Sorry about the eggs, though

 

[OkChickens]

Ok, what is to high of humidity for incubation and hatching? Also should hatcher be around 99-100 degrees? The embryos are mostly full term. They are feathered out.

Nate

 

[ScissorChick]

Well high humidity means to much moisture basically.

& Yes, both incubator and hatcher should be at 99-100F