It may take some time for the gut to heal after a bout of coccidiosis. The sulfa drug you have can treat coccidiosis as well. I would use some probiotics, and although vitamins are not always necessary, they won’t hurt for a few days.
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I did not know that!!! Thank you for that about the thiamine!First: What I don't know about poultry illness and injury would fill books, and does! So take my next sentence with a spoon of salt:
Yes, it sounds like it could be coccidiosis.
Now, the part I am MUCH more confident about.
Here in the US, the most common feed addative coccidiastat is Amprolium. Amprolium is a thiamine antagonist (that is, it blocks thiamine uptake by being a more attractive (but less useful to coccidia) alternative). I assme the UK also uses Amprolium, or something which works via the same mechanism - your feeds are much less well documented than ours across the pond). It is almost completely ineffective in the presence of high thiamine feeds/diets, and poutry nutri booster almost always contains... extra thiamine.
[chicken feed, i do know a little about]
Withhold/discontinue the Nutri Booster, and treat for coccidia as normal. It can't hurt, and it will almost certainly help.
Thank youIt may take some time for the gut to heal after a bout of coccidiosis. The sulfa drug you have can treat coccidiosis as well. I would use some probiotics, and although vitamins are not always necessary, they won’t hurt for a few days.