Fresh, stinky eggs in the nest box. What is this all about?

Hi folks,

Today is the fifth day in a row that I have gotten stinky eggs. They are from my bantam ducks (I didn't put this in the duck section because this is really an egg question).

Here's the deal. For the last five days, at least one duck has been laying stinky eggs. One of them was slightly cracked and a little weepy. That was the first one. There have been no noticeable cracks since then, just stench.

The eggs were never left in outside or in the sun or in a warm spot for long. I pick up eggs several times a day.

The eggs have not been in the same stinky nest box. They have been laid in at least three different areas, one of which is about 70 feet from the others.

With the one exception, they have not been cracked.

It is not just one duck who is responsible. I know this because I got a stinky warm egg about 4 hours ago, and another one just now. Both were warm and fresh (and in different parts of the hen yard).

They don't seem to stink when cracked (it's hard to tell because I get the stink on my hands) and I feed them to the dog.

I mentioned this to my neighbor who said that a duck egg I gave her a few weeks ago was rotten. I didn't know this until last night. She had the eggs a few weeks ago (and it was fresh).

What could possibly be going on???

Many thanks.

 

Oh, I probably should have mentioned. I feed them Coyote Creek organic mash and garden/kitchen scraps. They have fresh water. I don't know what else to add. I will be thrilled with any advice you can dish up!