Or incubating styles…..I figure it this way--- better to have clears and pull them early , then have them start and quit. I'm betting shipping causes many eggs to qut before they even start.
I shipped two boxes of eggs at the same time from the same pens to two diferent locations. One person had only a few develop, andthe other person had 23/26 develeop. Same eggs, same pens, same age on the eggs. ME thinks shipping is afoot here.
On my turkey eggs, I've had 100% hatch rate so far this year. I sold a dozen to a guy a mile from me who runs a still air styro bator. I checked in with him on hatch day (he and I set at the same time) and while mine were popping out left, right and center, he didn't have a single pip yet. I sold a second dozn to another gal with a styro bator (still air, I think, but don't quote me). They were doing great for the first 48 hours but then she went out for a few hours, came home to find the thermometer sitting at 106. I told her to leave them in awhile but two weeks later she says candling indicates they are not doing anything.
Since my eggs in my Rcom are hatching at 100% rate, and so far my two customers have 0% (shipping not a factor), I have to conclude that there is no issue with fertility but it is the incubation process itself that is failing - certainly something outside my control. Your two customers with the very different hatch rates might have incubation factors going on in addition to potential shipping concerns.
I agree on the early clears. I never pull before day 7 but I generally am happy to free up some space in the incubator so I can set more eggs…..