Phibro Animal Health Corporation

Dennis P Bayrock

David Alan Fowlie

Wayne Mattsfield

A method of controlling microorganisms such asmetabolism in mash in an ethanol production facility includes adding to the mash an effective amount to control such microorganisms of one or more of a substantially water insoluble pristinamycin-type antimicrobial agent, a substantially water insoluble polyether ionophore antimicrobial agent, or both, wherein the term 'substantially water insoluble' means the antimicrobial agent has a solubility in pure water at 20&#xb0; C. of 0.1 grams per liter or less, and wherein at least a portion of the substantially water insoluble antimicrobial agent(s) is added to the mash in the form of: 1) an organic liquid comprising at least one organic solvent having said substantially water insoluble antimicrobial agent(s) dissolved therein, said organic liquid advantageously comprising more than 1 gram per liter of said antimicrobial agent(s); 2) particles comprising said substantially water insoluble antimicrobial agent(s) and having a weight mean average diameter of less than 5 microns; or 3) both.

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Rosemount, MN, United States of America

Dennis P Bayrock