How can you give a chicken antibiotics systemically? My rooster has a bad case (so I think) of scaly leg mites which has led to swelling and infection. The daily topical spraying has improved the legs somewhat, in that they are a lighter pink. But they are quite dry now and still swollen. I would like to treat him with a systemic antibiotic to clear this up. How do I do it and what do I give? Do I give him an injection or is there a oral solution? What and where to buy?