Nov 2nd of this year I bought 13 golden comets from the a local feed store. Wanted to try to have hens starting to lay their first spring rather than starting just in time to stop for the winter. The feed store didn't have medicated starter feed so I mixed a little ACV in their water. Everything was going fine until I lost one @ 2 1/2 weeks. She was always a bit small so I didn't think much about it. Then, at about 4 weeks, 1 then another got wobbly, - stagered like they were drunk, by the third day the first was dead. Over the course of a week I lost 5 the same way. Asking locally I found some antibiotics I could give them ( Istopped the ACV at the same time) & all was right with the world until last week. Another started getting wobbly so I restarted the octamiacin (SP) but lost her today anyway. I just came in froom their afternoon feed & it looks like two more are dizzy & I'm afaid I'm going to lose more. It's ben Theve been in a 4 x4 brooder in the hen house. Outdoor temps have been in the 50's during the day with some nights getting down to the low 20's. I've had three lamps on them the whole time. Two ate 24/7 the third on a thermostat so it doesn't overheat. Supposedly my bakers dozen are the only ones out of a hundred purchased that are having this high mortality rate.