Hi, I just brought home some chickens from a local auction livestock auction. They are my only chickens, not adding to a existing flock. One of the more knowledgeable people at the auction said that because they were exposed to so many birds at the auction, several hundred, I should probably treat them with a mycin type antibiotic and some vitamins and electrolytes for seven days as a preventative. Does this seem like good advice? I've read that you shouldn't use an antibiotic if they aren't sick.