Free range on 85 acres. One of our wilder hens has been showing a severe limp lately, about 10 days. I finally was able to catch her today in a driving rain storm. One leg does not move but I cannot discern a break. Both legs show swelling and some soft lumps. According to Storey's Poultry it could be Bumblefoot. I will open the sores and drain them but can I give an antibiotic injection and of what dosage? I have Penicillin, Bio-Mycin 200 and Fortified B complex that I usually use to treat our Boers. Your earliest response is appreciated. She is going down pretty fast.