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Infertile. If it was fertile it would have the white spot and a white ring around it. It will be really bold. Being in an incubator for 7 days it should have started to develop an embryo which would be small and pink.
Quote:-Kathy
I don't think so. Once my duck starts laying I'll crack an egg open and post a picture. The white spot in an infertile egg is called Blastodisc and fertile egg it will have white around it and it's called Blastoderm. Easy way to keep them straight in my opinion. Blastoderm is means fertile because the suffix -derm means skin. That spot will develop into a chick and chicks have skin.
Thank you. I think that all embryos develop at 7 days and then how they develop from the 7 days to hatch varies from species to species. I could be wrong.35-37 days.
-Kathy