Discovered one of my new ex-batts has sour crop this morning. Spotted her shaking her head in the telltale manner, so "vomited" her and a load of gunge came up. Not sure how long she's been like this as I've been away, and my partner was in charge. She was looking slightly under the weather before I left, but discovered she had a bad case of lice, so treated that, assuming it was the problem. Another hen died before I left from a blocked crop (died while having the blockage cleared at the vet), so wondering if the sour crop in this case is due to a blockage. Anyway, have just spoken to my vet, he says he has never had much luck with ketoconazole, but to give it a go, and he'll give her Nystatin if it doesn't work. I'm happy to get the Nystatin now, but he thinks I should try the ketoconazole first. Does anyone have any experience of this drug, and its effectiveness in treating sour crop? She's still shaking her head, but I can't get anything up when I try to vomit her again. Should I just give her the meds, and leave her for today to see how she goes?