I noticed yesterday that my 8 month old Andalusian hen's crop looked full in the middle of the day. I immediately turned to google so I knew what to look for when I examined closer. I felt her crop later that night and it seemed firm like normal. I was nervous though and the next day have her some milk to either help flood out a impacted crop or, I had read, to cure a sour crop. Later today I noticed the crop still seemed abnormally swollen for the daytime and decided to feel it. It was squishy and not at all like the firm crop I know to be normal. Knowing that it was indeed sour Crop I massage her crop holding her head down hoping she would vomit. She doesn't do I just let her go while I don't more time researching. I read Apple Cider vinegar was good for the yeast infection so tonight I had her eat some bread that had been soaked in it. I also decided to isolate her from the flock and the regular pellet food to make sure her crop was empty in the morning. I plan to give her plain yogurt and scrambled eggs once her crop empties but I am worried right now that I have her too much apple cider vinegar. . . What exactly does apple cider vinegar do to a chicken and how much is too much and why?