I had determined that some of my hens had ended up with a respiratory infection. I have been treating all my chickens with electrolytes and duramycin. However, I had three of the them that weren't improving. I ended up putting them down today. I am wondering did I do the right thing?!? My opinion is that sacrifice some for the good of all, but I can't help but think that maybe I could have done more or something else. I have two other hens that are rattling and shaking their heads. I don't want to continue feeding them duramycin. Can anyone recommend some support?