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Between the dates of 9/18/2019 and 10/23/2019, researchers from the Animal Production Department at the College of Agriculture at Al-Qasim Green University will carry out their study. There were 240 Ross 308 chickens employed in the study. The baby chicks were split into four groups for the various experiments. The following parameters of drinking water were examined when a suspension of leaves extract was added at concentrations of 0, 3, 5, and 7 ml/liter: body mass index, feed intake, feed conversion ratio, and mortality rate The results demonstrated that the average live body weight, total weight increase, and feed intake of the broilers were significantly enhanced by supplementing their diet with an aqueous extract of Origanum vulgare leaves. Both the feed conversion factor and the mortality rate were rather constant throughout all trials.