Hello everyone, I'm a beginner of rasing chickens for egg production. I have a Barred rock hen that was coughing and sneezing when i got her and now she is getting so bad and you can hear her wheezing while she breathes. She also has bubbles like stuff in her eyes. So i went to our local feed store and bought Duramycin-10 Tetracycline Hydrochloride soluble powder and im not sure how much to give just 1 chicken. Can you please help??...Thank you

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