Here is the background: I put 30 shipped eggs in the bator 23 days ago. They came from a very generous and contientous BYCer, who keeps excellent records. They came from two seperate breeding flocks and were marked with the Roosters initials; 12 eggs from C., and 18 from F. They were stored the same way, collected the same way, shipped the same way, incubated in the same bator and handled the same way. Of the 18 eggs from F, I got 13 chicks all on day 21, the other 5 were infertiles or what looked like shipping breakdowns, 1 zipped but didn't hatch, looked like he got turned wrong and aspirated some fluid - pretty good hatch, really good actually. Of the 12 eggs from C, I didn't get one chick. I let them go until today (day 23) and then performed "eggtopsies". I found the results very interesting, it looked like I had a quitter every other day. I could have taken pictures for an embryo development book. Right up to day 21. there was an infertile double yolker, a scrambled yolk with just a speck, a five day, a 7 day and on and on. The breeder said he also has had many problems from the line of hens he has in that breeding pen; mishapen eggs, very porous shells, and they have not held up in shipping well. The shells were very porous which made it a delight to candle . . . and the eggs were slightly elongated but I have seen much worse. So what do you think? there was no obvious sign of bacterial invasion, they didn't all stop at any one point, the eggs from the other breeding pen in the same incubator did great . . . Just looking for opinions on a curious situation.