I cut day 45-50 depending on the day of week it falls on. Never lost a hatchling or had problems.
When eggs develop mold on the surface where i cut or they pipped,I use sterile saline solution, few drops every other day till they hatch. This keeps the surface where you cut or where they have pipped clean and reduces bacterial growth till their out.
I incubate at 88.1-88.4 and all babies are out by day 54. Cutting a week ahead gives me a idea of whats in the egg and if anything is wrong with a baby inside that needs assisting.
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