Three feeding trials were conducted at different locations. Although FCR varied widely among trial sites, supplementation with DMG at a dose of 1 g Na DMG/kg resulted in an improvement of feed efficiency during, at least, the starter phase in all trials. Although effects on FCR were most consistently observed and most pronounced during the starter phase, FCR was in 2 of the 3 trials improved over the whole rearing period. In addition, finishing BW and PV were increased in 1 of the 3 trials. Organoleptic quality of roasted breast meat was similar between control and DMG groups. On the whole, this investigation demonstrated beneficial effects of supplementary DMG over a wide range of broiler strains, basal diets, and rearing conditions. A previous tolerance and safety study demonstrated that DMG does not accumulate in edible parts of broiler chickens when supplemented at a dosage of 1 g Na DMG/kg and, therefore, does not pose a consumer risk of involuntary intake of DMG intended as a broiler feed additive (Kalmar et al., 2012).