The present invention refers to a glycerol ester composition comprising the reaction product obtained from reacting valeric acid and glycerol at a molar ratio of between 1:0.8 and 1:1.2, for use in reduction and/or inhibition of the growth of gram-positive, pathogenic bacteria. The present invention also refers to said glycerol ester composition for use in prevention and/or alleviation of necrotic enteritis in the gastric tract of galloanserans.
