I have 15 Rhode Island Red laying hens. They are approx. 1 year old. This winter (in Vermont) they developed cold symptoms, sneezing,coughing and head twitching. I had a heat lamp on when it was bitter cold but didn't have much ventilation. I treated them with a broad spectrum antibiotic (Oxytetracycline) in their drinking water for ten days. This seemed to help with the cold symptoms however they are back to twitching their heads every 5 seconds or so, the whole flock does this.They act like a dog slinging off water. My birds free range during the day and all seem to eat and drink well. Some feather pecking around the tops of the tails, I spray that area with Blu kote. I get a serverely ridged egg every three days but I don't know which hen is laying it. Are the normal eggs safe to eat? I only get about 8 eggs daily but have 15 hens?? I have never wormed them, I didn't know I had too, should I ? I change the wood shavings every 1-2 weeks throughout the year, I recently disinfected the coop and pressure washed it. I give them the best food I can get and two handfuls of cracked corn as a treat daily ,sometimes table scrapes and fresh water with electralites and vitamins and minerals everyday to help with their health problems for now. Can someone please advise me as to what is causing the head twitching and ridged egg.I just want my girls better and have tried everything I could think of, I need help
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