After 10 years with no chickens I now have some again, and am in process of acquainting 2 6-7 month old girls (RIR and Blue Cochin) with 5 Speckled Susses pullets about 3 months old. All has gone well, but I noticed yesterday one of the young ones seemed to have no neck, or was keeping her head pulled in, then last night she was gurgling, and I don't know if it was only after I fed them a dish of cooked pumpkin and a dish of cranberry sauce, or before. She was also a bit lethargic. I added ACV to all the water last night which I had not done until then. This morning I was prepared to be late for work so I could get some duramycin-10 and bring it back and add to water to avoid potential illness in entire flock, and when I let them out the one who seemed possibly ill dove into the food and seems fine - so now I'm not sure what to do. I really really really don't want to give antibiotics if I don't have to, will pick some up on the way home to have on hand in case, which I should have done anyway, just not sure whether to watch another day or treat pro-actively.