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We have a homemade incubator. It is all digitally controlled - - - thanks to my Dh's electrical background.
We did not callibrate all the equipment on the first hatch - - -
I hatched 1 / 4 roos for the delawares
I hatched 4 /4 roos for my own stock
and hatched 6/ 9 roos for another breeders bcm stock.
On the second hatch, we calibrated three sets of temperature gauges. . . .
I hatched a total of 10 / 16 roos . . . . 7 / 9 were the marans that I am tracking / studying.
The second hatch went PERFECTLY. The normal size eggs hatched on Day 21. The Jumbo eggs hatched on Day 22 / 23.
I did not have any early hatchers on either hatch - - - temps were not running high by that indicator.
That's great you can eliminate that factor it sounds like. I would lean towards it being a season thing, related to hatching in winter. Which is great, since spring is right around the corner!!