A fermented liquid feed composition for a target animal is provided, the feed composition being prepared by the fermentation of a feed substrate with a lactic acid producing bacteria, the lactic acid bacteria being characterised by: a) being viable under the conditions prevailing in the gastrointestinal tract of the target animal b) being an aggregating bacteria and/or co-aggregating with one or more pathogens and c) being able to produce upon fermentation in the feed substrate lactic acid in an amount of at least a minimum inhibitory concentration of lactic acid. A method of producing a fermented liquid feed composition is also provided. Preferred lactic acid producing bacteria for use in the composition and method are Lactobacillus.
