If I were using an egg carton, I would either take them out earlier or later than day 7... I’d either want the chick larger or smaller to have such a change in conditions.
@SnapdragonQ am I losing my mind or did you work with how to keep your eggs turning while upright in a NR360 this year?
I personally no longer do not turn shipped eggs from day 1. I used to rest inside the incubator and my shipped egg hatch rates have increased exponentially. I’ve read too many scientific articles that say the most important days to turn are the first three. Interestingly I believe the studies also say more eggs will quit if you don’t turn for three days and start turning than if you turn for three days and then never turn again.