DESCRIZIONE
It is provided a combination comprising cinnamaldehyde and cinnamaldehyde ethylene glycol acetal, an animal feed additive comprising the mentioned combination, as well as the combination for use in the prophylactic and/or therapeutic treatment of bacterial infections and/or immune-modulation or for use in improving the FCR or weight gain in terrestrial or aquatic animals. It is also provided an animal feed for terrestrial or aquatic animals with improved stability and traceability of the feed additive combination and a process for its preparation.