Good question,,,,, Day's 7, 14, 21, 25 for guinea, ducks and geese ......
Day's 7, 14, 18 for chickens ...
I am looking for the development of the embryo and the dehydration in the egg itself and the placement of the air sack as you will notice several od the guinea egg's in the photo are not in the correct place ......
My kids get to watch the development of the embryos and after all of these years they still get excited every time
And it also look's like I am doing it correctly when I take photos of my incubator
gander007