Use of diaminoguanidine derivative and feed composition thereof in preparation of veterinary drug

A process for managing, treating or alleviating a disease caused by bacterial infection in an animal by administering to the animal a therapeutically effective amount of a diaminoguanidine derivative of Formula (I), or a stereoisomer, geometric isomer, tautomer, solvate, pharmaceutically acceptable salt, or prodrug thereof:

• wherein,
• R is according to Formula (II) or (III):
• wherein R1 is a linear or branched C1-C20 alkyl group;
• A is O, NH or S;
• and R2 is a linear or branched C3-C14 alkyl group, C5-C6 cycloalkyl, C6 aryl, or —CH2(C6 aryl);
• and wherein the pharmaceutically acceptable salt is a D,L-lactic acid salt, methanesulfonic acid salt, 2-hydroxyethyl sulfonic acid salt, citric acid salt, tartaric acid salt, benzoic acid salt, succinic acid salt, fumaric acid salt, maleic acid salt, acetic acid salt, sulfuric acid salt, phosphoric acid salt, or oxalic acid salt, and wherein the bacterial infection is caused by Staphylococcus aureus, and wherein the disease is mastitis, a skin infection, a gastrointestinal infection, a respiratory infection, or a genitourinary system disease.