Cutting . . .
I don't ordinarily have to cut eggs (possibly one egg for every 500+ laid). In the Nursery, the eggs are hatching at 62 days this year, based on the temperature and humidity therein. In the main building, they're hatching at precisely 60 days this year (commensurate to temp and humidity). This brood looked just a tad dry (based on seeing that the egg shells didn't thin as much as others - usually because either the incubation medium was too dry from the start OR dried out from an inadequate closure). I don't care if they look dry when I'm right there to determine if they could become trapped inside from having too much "shell thickness" between their tooth and ambient air, but since I knew they'd begin to hatch today and I would not be there, I slit each one at top center-lengthwise-equivalent to 1/2 the length of the egg. They usually ignore my cuts, and emerge from their personal cuts, but by cutting them as I did, at least they would not be trapped if the shells, were they too thick
or the embryos had defective egg teeth. When I began my scribes Friday, I discovered that indeed these eggs WERE excessively thick for me not to worry during my absence today. They probably could have slashed out, but for what I knew was in these, I wasn't taking that chance. Not unlike albumin spilled on the stove top when you're breaking eggs over a skillet, it congeals quickly on snake eggs to seal my cuts (so no oozing). So, IFFFFF you have done your homework on knowing when they should hatch (within a week), you can cut them ahead of time. The cut you make will seal shut in minutes, so no essential nutrients will be lost. Then, if the embryo does not need to use the emergency exit you cut, it's just an ugly, sealed scar on the egg that will be ignored. I cut all 13 of these eggs on Friday, knowing I'd be gone today (and the cut on each one would be benign and probably ignored) so I would not fret being away. I've cut eggs up to 14 days early that all hatched, but I don't recommend this as a routine practice. Nine times out of ten, they ignore my cuts and emerge from their own.
REPEAT: Do not do this unless you KNOW you have a problem and only then, with the express assistance of an expert.