When you get your duck eggs in the mail, they should be good for 2 to 3 weeks in the fridge.
After 3 weeks or with older eggs, just crack them, by opening them first in a small clear glass bowl. If the whites look clear and have no smell, then they are still good. If the whites are just a little bit cloudy, throw them out, or if the whites are turning yellow. I have used unrefridgerated eggs in the hot summer time 80/90 degree heat, that were 3 to 4 week old eggs, using these guide lines.
Another method that can tell you the age of the eggs you bought, is to use a bowl filled with 4 inches of water. Submerge the eggs in the water, one or two at a time. If the eggs lay flat at the bottom of the water they are fresh, if the egg stands upright on the bottom then they are getting old. If they float, throw them out, they are too old. This is a very reliable test, because as an egg ages, the air bubble in the egg grows larger.
Years ago, before I had my own ducks, a friend gave me a large basket full of eggs of various ages, from their 4 pet ducks. I was able to figure out which ones were good and which were bad. I hard boiled the good ones and made some wonderful egg salad.
When you get any new eggs, always examine them for any cracks. It's best not to use cracked eggs. But, they can be a great treat for your dog or cat. I open them and check to see if their is no smell and then fry them up to add to their food.
I hope this helps!
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