A feed for livestock, poultry and fishes for increasing a disease, pseudorabies resistance wherein a bile powder and bacterial cell containing peptidoglycan are mix in a basic feed in order to reduce losses due to infectious diseases including pseudorabies, by increasing the physical function of livestock, poultry and fishes using as little medicine as possible; and a feed additive for livestock, poultry and fishes including bile powder and bacterial cells containing peptidoglycan. Yabiki , et al. December 7, 1993

A method of enhancing the ability of cattle and swine to resist diseases caused by microorganisms which comprises the steps of adding an antimicrobial effective amount in a range of 0.01 to 0.2% by weight of bile powder to a livestock feed and administering the livestock feed prepared to the cattle and swine. The method may also comprise adding a pharmaceutical effective amount of one of the following: licorice, garlic or quillaja powders or extracts thereof to the livestock feed.