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For the development of this work, the effect of oregano essential oil on productive variables in Cobb 500® chickens was evaluated. It was carried out in a conventional barn, using a completely randomized design (DCA), in which 200 chickens from the Cobb 500®-line, one day old, located in 20 pens on the floor, were used. The treatments used were the following treatments: (T0) without inclusion of oregano essential oil, and with inclusion of oregano essential oil, groups (T1) inclusion of 150 ml/1000 L, (T2) inclusion of 300 ml/1000 L, (T3) inclusion of 450 ml/1000. Each treatment consisted of five repetitions of 10 chickens per repetition (pen). Sampled in their entirety at the end of each productive stage: pre-start (1-7 days), start (8-21 days), growth (22-33 days) and fattening (34-42 days). The variables were evaluated for normality and homoscedasticity, then subjected to parametric (ANOVA and Tukey-Kramer) and non-parametric (Kruskal Wallis and pairwise comparison) statistics at the significance level of (p < 0.05). In the results showed highly significant differences (p < 0.0001) for the entire cycle between the treatments including oregano essential oil (T1, T2, and T3) and the treatment without oregano essential oil (T0) for the variables of: live weight, weight gain, feed intake, and carcass yield. Therefore, it is concluded that oregano essential oil has favorable effects on these production variables.
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