I've tried doing some research about intestinal shedding, I didn't know anything about it. Some people say it only happens when a duck is sick, others say it can happen at other times as well. None of these people were vets so I still don't know much. Sorry, it was very inconclusive.I have another question
Is this much blood in duck’s poop every once in a while dangerous?
I saw blood in her poop again. I really have no idea what could it be. The vets have no answer as well.
What is intestinal shed? Why does it happen? And how does it look?
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If you lived somewhere wet, like me, I would suggest possible coccidiosis. My other duck, Pigweed keeps getting it and it gives her diarreah. It commonly give blood spots in poop, too, but that hasn't happened with Pig. My vet always does a second type of fecal test to look for it, though. So maybe you should call your vet and ask if they did a test that would find that parasite. Though, with her being inside and it being dry there (it is dry there, right?) I find it unlikely.
I do have an idea about the blood spot though. Does it happen shortly after she lays an egg? Maybe the egg is a little bigger or oddly shaped than normal. In that case it's probably not a big deal.
How is she doing?