I have an cow that has a dislocated hip. She also has an infected foot. We have had her on antibiotics and banamine, but nothing has helped. I think we will have to put her down. I was reading the literature that came with this antibiotic and it says for horses, and not to use on horses that are used for meat. How long would it take to get this out of her system or does it go out of the cow's system? Thanks!!