Hi, we just rescued 6 abandoned chickens which we are intending to integrate them with our 4 hens of a year. We noticed that the two largest have the symptoms associated with impacted crop condition and are getting conflicting results for treatment. They are healthy and eating with no signs of trouble except for the hard softball sized crops predominantly displayed. One member performed a procedure herself using kits from tractor supply to open, expel the contents, then repaired by suturing the wound, to the commonly used treatment of olive or coconut oil and massage. In a majority of treatments,' the bird was inverted to allow fluid to drain out and the bird free from exasperating on it which is not recommended by local vets (with limited chicken experience in a metropolitan area). I have yet to find the specifics like how much and best oil to use, massage techniques, feeding restrictions, and the important "Do Nots" would be greatly appreciated. Thank you for your time, Mike.