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What I'd like to know is, how do you know when an egg is infertile vs. and egg that died in transit due to environmental issues?
I hatch 60-90 eggs every week and also sell hatching eggs. I know my hatchout rate and fertility rate, and the average hatchrate on shipped eggs doesn't even come close. When customers see no development, most assume infertility, yet I know that is not the case with my eggs - my incubator proves the fertility rate every week. So, what's the difference in an egg that is infertile and one that died before incubation (or even during early incubation)?
The difference that I notice is when you crack the egg open, there will either be a bullseye (fertile), or there won't be (infertile). Regardless of how it travels, that bullseye doesn't just disappear. That's just been my experience.
But after incubating, the egg starts to break down and you can't always see that bullseye anymore, so that doesn't really confirm anything.