I have a hen that hasn't been feeling right for 2 days. Posted in the illness forum got ONE answer....possible gapeworm. So my question is this. If I wormed her yesterday morning with ivermectin how long until we will see an improvement? She seems a little better today, but that may just be my wishful thinking. I thank you all every day for this website, not sure how I would have all the chicken knowledge I have today if I hadn't read it on here!