very interesting info, I need to copy and keep. Why do eggs not hatch if the bator gets too hot for a couple of hours say 104 . Is that because the veins and embryo are developing, and then no longer can take the heat. I wondered how in the world eggs layed in 110 degree temps, (like Phoenix, Arizona)ever make it to hatching. Once the hen starts setting on it, her body temp probably insulates them and keeps them from getting any warmer.
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Dry ice is for frozen, actually the heat should not hurt them unless it is over 114.8F for over 15 hours. This is the temp used to heat treat eggs for MG/MS, there is a 10% loss if eggs are infected. If the eggs are packed correctly and not left in the sun it is unlikely they are reaching that temp. Most times eggs have a bad hatch probably is from rough handling.
I shipped last month eggs from NC to Texas, both our states are HOT. I received a report back from the buyer that 7 out of 8 were fertile and 6 out of the 7 hatched.
My eggs are wrapped with the small bubble wrap with a length long enough to triple around the eggs. They are then wrapped 3 times with a piece of paper from a old phone book. They are then either suspended in shredded paper or packing peanuts. I only use the 12X12X8 priority box never the small box. The more the eggs are isolated from shock the better chance they have. I am amazed at how many shippers ship in the small box. I have never had 1 egg hatch from the #4 box. And will not buy from any seller who uses them. No offense but the larger box is free, and packing materials are not that expensive.
Eggs sit in nest box outside in the heat in the summer until a broody sits on them. Most people have good hatches with this method. I can't imagine any postal employee sitting in a vehicle that is over 114.8F. It may be more possible with a urban carrier than a rural though, as they walk their route.