I'm almost sure Betsy, our Jersey cow, has mastitis in one quarter. It is a little harder & no milk will come out of it. Can someone tell me how to treat this, I can't get ahold of a vet around here because it's saturday. I have penicilin, LA200, or Vetrimycin 200 but don't know which one to use & how long. Should I keep trying to milk that quarter, should I pull the calves that she is nursing? I'm new to this & don't know where to start, thanks in advance.