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I had the same issue last year with turkey poults. I lost so many to yellow glue. But I had too many variables to figure out the cause for sure, but it was worse when I knew there was a temp spike that may have changed the proteins in the albumen. I also saw two other contributing factors. If humidity was too high, there was still a lot of albumen at hatch time and the poult could not consume it all before internal pip, and the air cell was proportionately small. When hatches were late with small chicks and lots of liquid it was pretty much a guarantee that the poults would be DIS or glued if assisted. If I adjusted temp and humidity so that the poults were 2/3 egg size and air cells 1/3 egg size and no visible liquid, then the hatches were successful. That was too much of a gamble in the EZ-Bakes and even the redwood Leahy, hence the GQFs and Brinseas.