Too much layer can damage the kidneys. If that happened, stopping the feed is unlikely to cure them.
Just because you haven't seen signs of parasites in the other animals doesn't mean they don't have them.
Oxytetracyline might help, but it's not what I would use.
If this one dies can you afford to spend $90 to have a necropsy done? That's what your state lab charges for necropsies. If you aren't close enough to drop them off you can overnight them on ice. UC Davis lets us (CA residents) use their FedEx account number which saves a bunch on shipping, so call and ask if they do the same.
Another possibitly is duck plague, which I believe Muscovies are more susceptible to.
As I said before, if mine and i could not take to a vet I would treat for everything and provide supportive care, but this level of care and treatment does require a lot of work and some money. One would have to buy the drugs (wormers, coccidiostat, and antibiotic) and tube feeding supplies (tube, syringe, and baby bird food).
Good luck with whatever you decide and let me know how things go.
Here is the lab:
http://www.nmda.nmsu.edu/vds/
Just because you haven't seen signs of parasites in the other animals doesn't mean they don't have them.

Oxytetracyline might help, but it's not what I would use.
If this one dies can you afford to spend $90 to have a necropsy done? That's what your state lab charges for necropsies. If you aren't close enough to drop them off you can overnight them on ice. UC Davis lets us (CA residents) use their FedEx account number which saves a bunch on shipping, so call and ask if they do the same.
Another possibitly is duck plague, which I believe Muscovies are more susceptible to.
As I said before, if mine and i could not take to a vet I would treat for everything and provide supportive care, but this level of care and treatment does require a lot of work and some money. One would have to buy the drugs (wormers, coccidiostat, and antibiotic) and tube feeding supplies (tube, syringe, and baby bird food).
Good luck with whatever you decide and let me know how things go.
Here is the lab:
http://www.nmda.nmsu.edu/vds/