1. A method for determining effectiveness of an administered drug in treating a disease of a group of livestock using auscultation analysis, said method comprising: administering a first drug to a group of livestock; conducting auscultations by an electronic stethoscopic device communicating with a computer processor to record auscultated sounds from the group of livestock; determining, by said computer processor, a lung score corresponding to a respective level of severity of the disease for each livestock at the time of and based on the auscultations; recording, in said computer processor, the first drug administered to the group of livestock; recording, in said computer processor, fatalities for the group of livestock over a designated time period; conducting, by said computer processor, a statistical analysis to determine whether there is a statistical difference in fatality rates between lung score categories; analyzing, by said computer processor, the statistical analysis; automatically determining, by said computer processor, a numerical relationship between fatality rates as a function of lung scores to determine effectiveness of the first drug, said automatically determining step includes: generating a graphical comparison of fatality rates versus lung score categories, said comparison including a predicted probability line of the fatality rates as a function of the lung scores; determining whether the first drug is effective or ineffective based on the slope of the predicted probability line, wherein the slope of the predicted probability line being positive indicates drug effectiveness and wherein the slope of said predicted probability line having a zero slope indicates drug ineffectiveness; and administering a second different drug to the group of animals when the first drug is ineffective, or administering the first drug to the group of livestock when the first drug is effective.