We had a sick hen back in October. She had an impacted crop and I called every vet in our area and none of them had a vet that treated "exotics". I searched online and found that internal parasites could be contributing to the problem and while searching for treatments I found a post from a fellow chicken owner giving a recommendation to try Buff Clucks products so I did and after withholding food for several days and then treating with Worm Stop she has fully recovered and is laying eggs with the rest of our girls. I'm a firm believer that these products work...we have five hens and yesterday was the first day they each laid an egg!!