https://www.backyardchickens.com/t/714586/sour-crop/380
John: Here is a really good page of that thread and sour crop... This TwoCrows has lots of birds, good experience, wise with treatment of her birds. You might want to employ your lady friend to make some purchases too. LOL One of the good meds is Monistat cream or Canesten (UK version) Because it will adhere to the inside of the crop and kill the yeast. They also discuss the use of Yogurt (creates extra mucus in these birds) and when to use ACV. And a little further down you can see the crop bra apparatus.
John: Here is a really good page of that thread and sour crop... This TwoCrows has lots of birds, good experience, wise with treatment of her birds. You might want to employ your lady friend to make some purchases too. LOL One of the good meds is Monistat cream or Canesten (UK version) Because it will adhere to the inside of the crop and kill the yeast. They also discuss the use of Yogurt (creates extra mucus in these birds) and when to use ACV. And a little further down you can see the crop bra apparatus.