I have read a lot of stories about impacted crop, sour crop and I wonder what causes this?? Am I Just Lucky?? I have been raising chickens for over 50 years----some times with 100 to 200, some times with 3 or 400, and have had over 1200 for a while. I have never had crop impaction, or sour crop that I know of--rarely loose a chicken. I wonder why?? I rarely have a chicken close to 3 years old or older either. Does it happen to the older?? If younger too, I wonder why I never have had it??? I am serious---I do not know or would not know what to do if one had it----really has got me to thinking about this???????????????