Performance of broiler chickens fed event DAS-40278-9 maize containing the aryloxyalkanoate dioxygenase-1 protein

► Event DAS-40278-9 corn contains a transgenic trait conferring tolerance to 2,4-D and aryloxyphenoxypropionate herbicides. ► Grain from DAS-40278-9 contains the AAD-1 enzyme from the soil bacterium Sphingobium herbicidovorans. ► Grain from DAS-40278-9 and a near-isogenic line resulted in similar performance when fed to broiler chickens for 6 weeks. Event DAS-40278-9 maize grain (containing the aryloxyalkanoate dioxygenase-1 protein), a non-transgenic near-isogenic maize grain, or one of three commercial maize grains were included in the diets of broiler chickens for six weeks. Growth, feed conversion, and carcass measurements indicated no significant difference between the groups fed the diets containing the DAS-40278-9 maize grain and those fed diets containing the matched control grain. The absence of adverse effects in this study supports the dietary safety of the AAD-1 protein expressed in event DAS-40278-9 maize.