What am I doing wrong?

[superjjf]

The last few hatches from shipped eggs I have had 3/9 4/9 1/4 2/7 2/12 3/9 hatch. The second number was not the eggs set, but the eggs at lockdown. This time I put 28 eggs into lockdown, 7 hatched, but one is fat and can't stand. Temperature was at 99.5 in a still air with 60-65% humidity. The temperature did dip half a day to 97-98 when someone changed the house thermostat. The eggs were set at 99.5 in a forced air incubator using the dry hatch method. I cleaned the incubator out with white vinegar the week before. Could the cold weather be doing this? I just blamed that until my home eggs only hatched 3/9 (they usually are ~100%)

Using Little Giants

I eggtopsied the last hatch, 3 internal pips 3 died early and 3 external pips not hatched. The rest were fully formed, dead in shell. Some were starting to blacken.

 

[brahmabreeder]

First off shipped eggs almost never hatch well. Plus you have a till air incubator. Those create an unequal environment for the eggs. I would add a fan and see if that helps circulate everything.

 

[superjjf]

Isn't it bad to hatch with a fan?

 

[brahmabreeder]

No mine has a fan and I always get good hatches. Most of the more expensive incubators have fans in them.

 

[CayuseRanch]

I think I would check your humidity maybe calibrate it. If its making it to pip more likely a humidity issue than a temp issue. Eggs at the hatching stage have more tolerance to temp differences and less tolerance to humidity changes.

 

[ChucktheChick]

I think I would check your humidity maybe calibrate it.  If its making it to pip more likely a humidity issue than a temp issue.  Eggs at the hatching stage have more tolerance to temp differences and less tolerance to humidity changes.

how do you calibrate it? Just wondering since ive never had to do it before.

 

[CayuseRanch]

There is a salt test somewhere on here. Try searching calibrate hydrometer in the byc search box.