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It's not possible to determine fertility on fresh eggs by candling... They need to be incubated for at minimum 24-72 hours, generally 48+ hours before you can determine fertility by candling... Not sure what you are getting at, eggs are shipped cold, there is no realistic way to start or...

You can't tell fertility by candling until day 2 or 3 of incubation, and then if they were to stop incubation and ship it would kill them...