Sour crop can be dangerous for your chickens, so it needs treated immediately. Make sure you thoroughly clean all of your feeds and waterers so that the infection doesn’t spread. Isolate the bird and gently massage the crop and offer lots of fresh water with apple cider vinegar in it. Remember, chickens can’t vomit so don’t attempt to flush their crop out yourself. If there’s no relief for the chicken after 24 hours I would consult a vet. Sour crop has a sour yeasty smell so it’s easy to identif