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(Candling

hold the egg up to a light and look through it, if it is fertile there will be a dark spot.)

No, sorry, although the above answer seems to be on more than one copy of this question, it's wrong. You can't tell if an egg is fertile that way unless it has been incubated. If incubated, you will probably see red veins first. Incubated duck eggs are very active inside. You should see some movement in the embryo. At the earliest, I tend to think I'm seeing a beating heart, but it might be something else moving around. If all you are seeing is a dark spot with no happy veining or movement, that's not a good sign. Most of the time that's either a dead embryo or a bit of rot. You might want to look up some egg candling info. 10 days into incubation is usually the earliest I check, but I have peaked earlier now and again.

If you haven't been incubating the egg, the only way to tell if it is fertile is to crack it open. One side will have a white spot. If the wrong side is up, carefully turn the yolk with a spoon. If the white spot looks more like a bulls-eye, the egg is fertile. If it is just a single white spot with no ring around it, it is infertile. Of course, at that point, you'll be making an omelet instead of hatching ducklings.

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14y ago

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