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Chickens can suffer from several respiratory ailments, including Infectious Bronchitis (IB), Newcastle Disease, Avian Influenza, and various bacterial infections such as Mycoplasma gallisepticum. Symptoms of respiratory infections often include coughing, sneezing, nasal discharge, labored breathing, lethargy, and a decrease in feed and water consumption. The presence of these symptoms should prompt immediate investigation and intervention, as early treatment can prevent outbreaks and minimize losses.


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handbook of veterinary drugs pdf