Worms are parasites. I know that different meds treat different worms so it is not a one-for-all type situation. Your vet may be able to answer that or perhaps a search her on BYC for canker treatment.
I hope she continues to get better. Please know that neither peroxide nor vetrericyn is an antibiotic. She will need the antibiotic ointment stave off infection. It is also necessary to keep the wound moist with the antibiotic ointment so that it can heal properly.
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Only use an peroxide solution once; using it multiple times will thwart healing. What is better is clorhexidine solution - you can get this almost anywhere, but TSC has it. PLEASE read the label - it is sold super concentrated and you will have to dilute it to use it. Clorhexidine has...
Your rooster is fighting the others because he wants all the girls to himself. Are the other roos just now coming to age and b/c of that are now a threat to your silkie roo?
How many girls do you have? How many roos do you have? What is their environment like - coop/run - size hiding spaces...
Have you tried to make a mash out of her regular chick starter feed? I think she would do better if on something specifically formulated for chicks at her age. My chickens absolutely go nuts for their regular crumble mashed up. I simply wet the feed and make it mushy. They also love poached...
Sorry for your losses.
She is obviously in extreme stress. I would treat for that; warm, dim, secure space, sugar water or electrolytes in the water. Make sure she is drinking. I personally would take her out of the compost bin and bring her inside in a warm, dim spot.
Then, if you cannot...
Vetricyn is good for cleansing. Triple antibiotic will thwart infection. You can used the in conjunction with each other, but definitely keep the wound moist with the triple antibiotic a couple times a day.
You might want to check out each of your hens. If fly eggs are that close to the egg, they may also be on her. If they start hatching, they will start eating whatever is near, including your hen. That is really bad. Search flystrike.
I hope you find all the answers.
Epsom salts baths will go a long way to loosening the hard scab material. Keep it soft with plain (no pain killer) triple antibiotic ointment until it heals.
Could have been caused by the roost bar. This is the quote from a link where someone had the same type of issue. The link to that feed is after the quote.
It looks like it may be a breast blister, that is like bumblefoot, but on the breast/keel. It can happen when they rest their keel on the...
Yes. Put them under your broody if you want to hatch chicks. The chicks will imprint on her and she will raise them as her own. BE PREPARED though. Generally, half of the eggs that you allow her to hatch will be cockerels. That means that you will have boys to get rid of some way or another.