Just wondering, what dosage of Bactrim did your vet prescribe, for how long, and how much roughly does your chicken weigh?"
When we brought her into the vet ahe was just under 4 lbs and we could just start to feel her keel. I'm sure she is less that than now, but TSC didn't have a scale and I haven't had chance the to get one at Target. The vet prescribed SMZ-TMP at 165cc 2x daily and I had a rough start getting her going on it...she fought the syringe so I tried to sneak it in with some white rice and mealworms. She fell for that once. Im moatly here by myself at dosing time, but I've finally manage to work out the coordination to do it myself - though I throw a little extra in the syringe to account for the amount that gets flung on me

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I think I read about Bactrim in an article here about egg peritonitis, combined with glucosonate (?), but I think that was given by needle. Not to sidetrack the convo, but newbie question: what causes egg peritonitis and could it go from one chicken to another?
"Sorry that she is not eating much. Have you tried offering a variety of foods where one might strike her? Has she eaten any cooked rice and buttermilk? I usually try wet chicken feed—just a small amount in a cereal bowl with a lot of water. Then scrambled egg, tuna, chopped meat, or Friskies pate canned cat food. I tried to vary it on one very sick hen, so that she would not starve.
She may have a reproductive disorder that is slowing her crop from emptying. Some people will tube feed chickens who won’t eat.