My chickens were producing eggs at the end of summer. Then recently some of my flock got a bad cold, nasal congestion, cough. I immediately called our vet and they gave us a powder antibiotic. I started treatment right away and they begun to feel better within 3 days. They are still on there antibiotic but I will be weaning them off tomorrow. There egg production has definitely decrease. Im also feeding them Grubblies feed. Am I doing anything wrong????? Im worried??!! Thanks laura