I have 4 chickens, 1 cock. 2 white chicken hide...

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According to the clinical symptoms of your chickens, the main cause of these different symtoms  should be that the chickens are afriad from some thing such as cats. or dogs  and the secod  cause that there are inflammation in respiratory tract of chickens and i advise you to use oxytetracycline 50% powder dose therapy 1mg/liter of drinking water daily for five days
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