Originally Posted by frmboyinthecity
So just curious, for large fowl birds, how big do you get let the eggs get before you set them. I have a bunch of pullets that started laying a little over a month ago (First ones started at Christmas, but I'd guess on average they've been laying for about 6 weeks). They are covered by two dark cornish roosters. Right now, the average egg I'm getting from them ways about 47-49 grams, so would be in the small/medium range. Do you think I'll have an increased risk of hatching complications at that size?
I'll set them and let you know.
As long as the shell consistency is good (smooth, satin finish, high fertility, yolk size proportional to shell volume) then I would not hesitate to use them. It is easiest to get a consistent hatch out of similarly sized eggs. I'd rather set a tray of consistently small eggs than a mixed tray of pullet, bantam, large, and jumbos. But I do that anyway.
You can expect the chicks to pip day 19 and hatch on day 20, so I'd lock down a day earlier too. I do that by air cell rather than by date to account for incubator variations. As soon as the liquid remaining between the chick and the air cell is 3/16" or so, I move them to the hatcher.