The present invention refers to the use of a glycerol ester composition of at least one short chain fatty acid for preventing and/or alleviating necrotic enteritis in the gastric tract of galloanserans. The glycerol ester composition comprises at least 75% by weight of glyceryl tributyrate, below 25% by weight of glyceryl dibutyrate and below 8% by weight of glyceryl monobutyrate. The present invention also refers to the use of said composition for modulating the gut flora of galloanserans.
