I also would treat with Corid (looks like mucous is present).
"Medicated" feed will not treat infection, instead only reduce the risk of serious infection.
If she's egg-bound she needs immediate treatment.
I don't think use of a mister is related to her current condition (I have and use one) whereas dietary changes might be.
Depends on the hen (and chick). I had a similar situation last month where a d'Uccle hen hatched 6 (of 13, all her eggs) and left the nest. I checked the remaining eggs; one had externally pipped and was peeping, the second was peeping inside a closed shell.
I brought the two eggs inside...
I don't know what's available over the counter now. Do you have any feed stores near you that has antibiotics on the shelf? There are other animal antibiotics that would be useful.
Have you looked into online vet services? I've not used one, but it might be the fastest way to get a...
Given the trajectory he's on, I would treat him with first with an antibiotic, then de-worm once he's stabilized and improving. Logic being, even if worms started a problem, his gut is likely compromised where his weight loss is associated with a massive immune response heading towards sepsis...
Before getting a full-sized rooster, consider a bantam. They eat less while providing the same alarm/security that a full-size rooster provides. All else equal, their lighter weight is also less stress on the hens.
Regarding keeping roosters separate from hens, I never knew that was a...
Stating the obvious, you've got basically 3 options:
1) provide only supportive care
2) go to the vet (if possible)
3) treat empirically with antibiotics
Runny green diarrhea is usually green from bile, generally indicating a problem that will be associated with wasting away. If you have a...
Chicks naturally seek grit. In the wild, they will avoid grit too large or too small when appropriate size is available (they know what they're doing).
My advice, if only adult grit is available, is to grind up a few batches from 'probably too small' to 'probably too big,' allow this all to...
Not answering your question, but...
With materials you have on hand you might be able to construct a feeding station that is too small and difficult for the adult hens to access (I try to solve most problems with cinder blocks and scrap lumber/plywood). In this way, you could continue the...