It's air cell size throughout hatch that causes either lack of room or not enough air to hatch. The air cell doesn't have to be perfect but needs to be close to hatch properly
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I'm sorry about your eggs, but don't give up. Two years ago, I had tried over a dozen eggs before any were fertile and hatched.No fertile eggs...
Set 8 large Cornish eggs in place today.
Incubating and hatching eggs is a learning experience, but at least it's fun and you can get a reward(chicks) if successful. You'll have it down in a couple more hatches(trust me, there will be more hatches. You won't be able to stopOk, Im rethinking my candling saga from day 7. I watched a ton of youtube videos and I think maybe most of mine were in fact fertile. I just didnt know what I was doing. First I thought I only had seconds to look at them so I didn't really take enough time to look closely. I didn't see any veining so I figured they were duds and quickly put them back in. But most of my shells are dark so veining would be hard to see anyway. But I had my hubby video it and looking back I can see air cells and big very dark blobs like on one half-ish of the eggs. I think this might mean they are fertile after all. Im so dumbI think I may have one that wasn't fertile because I think I remember one being clearish all the way through but I didn't video that one so not sure. Anyway I think I will recandle them around day 10-12 and video it again....heres hoping it was newbie error and my chicks are developing...
That happened to me last incubation. The three eggs seemed to develop normally, but only one hatched. The other two were fully developed, but didn't hatch. One pipped and possibly drown. The other didn't pip. Hopefully, yours do great.My accurite reached 106 at some point between 11am and 1pm but was turned down at 1pm when seen at 104 and been back at 102 since. Hopefully didn't kill any.