Hi all, I'm a bit late to this thread but I came across it when one of my duck eggs was badly cracked. It was cracked through the membrane and there was a fair bit of blood, I would say the embryo was around day 12. I basically gently applied Vaseline to the cracked area and kept it in a very sterile environment to avoid infection and it's just hatched! It's absolutely fine at the moment, so for future reference, hope that helps!
