I have had to inject my chickens a couple of times now and I am feeling more comfortable doing it now. My avian vet is awesome and teaches me how to do things so I can do them myself, and provides lots of useful advice when needed. I currently have a hen with a crop blockage and the medication I am injecting assists the muscle action in the crop to help hopefully remove the blockage. I'm also giving her an oral laxative...after two days of it, the crop is looking much more normal. My chickens are pets and I love them dearly, so I would do what it takes within reason. I still don't LIKE injections, but I will do them when it's the best solution to getting them better!