I posted this the other day and the only answer that I got was that i was running incubator temp high. I already knew that warmer temp would cause early hatch I was running at 100 deg. Here is the senerio that perplexes me, I have three diff.color patterns of LF Brahma chicken eggs all set, randomly placed in the incubator, (so that discounts warm or cold spots in the bator as having this effect). when I set them in lockdown on day 18 one was pipping and was hatched in an hour. durring lockdown, I had the eggs seperated by type and all of one color pattern had hatched except 3 by day 20......one of the other color patterns have hatched two out of 11 and the third is pipped but not zipped yet. The third color pattern shows no sign of even pipping yet and they are due today. i know that they still may hatch within the next few days. my big question is could the type (color pattern)( they are all brahmas) have that much to do with the span of incubation time. The chicks that hatched earliest were Partridge Brahmas, The chicks that hatched second were the Blue Laced Red Brahmas, and the ones that haven't even pipped were Dark Brahmas. Anyone out there with any kind of explanation. Thanks in advance for your thoughts.