posted 7 years ago
You could be seeing symptoms of a duck with an infection, you might need to try an antibiotic for a week and see if that helps.
Feed stores sell antibiotics such as tetracycline, a broad spectrum antibiotic for about $10
The other cause could be a lack of nutrients such as;
calcium, zinc, fiber, vitamin B1, magnesium and phosphorous.
The easy way to make sure is with a multi mineral/vitamin from your feed store or even human pills dissolved in the waterer will work.