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espanolRESUMEN: El aceite de oregano contiene aditivos que pueden estimular el crecimiento de las aves, sin embargo presenta gran variacion atribuida a sus principales compuestos. El objetivo del estudio fue determinar el efecto del aceite de oregano en la dieta respecto de las variables productivas, altura de las vellosidades intestinales y acumulacion de sus compuestos antioxidantes en la pechuga de pollo. En total, 480 pollos fueron engordados de 1 a 42 dias de edad, siendo distribuidos en cuatro tratamientos, cada uno con cuatro replicas de 30 pollos. La dieta se formulo a base de maiz y pasta de soya, adicionada con 0, 100, 200 o 400 mg de aceite de oregano por kg de alimento. El consumo de alimento, ganancia de peso, conversion alimenticia y mortalidad se registraron semanalmente. A los 21 y 42 dias de edad se midieron la altura de las vellosidades intestinales y la acumulacion de compuestos antioxidantes en la pechuga de las aves. El aceite de oregano contenia 43,17% y 29,16% de timol y carvacrol, respectivamente. La ingesta de alimento, ganancia de peso, indice de conversion alimenticia y mortalidad no fueron afectados por la adicion del aceite de oregano a la dieta. La altura de las vellosidades intestinales incremento con el nivel de aceite de oregano suplementado en la dieta (P EnglishABSTRACT: Oregano additives could contain growth stimulating compounds for poultry, however, a great variation attributed to their main components is observed. The aim of the present study was to investigate the effect of oregano oil dietary supplementation on the productive variables, the height of the intestinal villi and the accumulation of antioxidant compounds in the breast of broilers. In total, 480 broilers were reared from 1 to 42 d of age and since the first day of life were allocated into four treatments, each with four replications of 30 birds. The formulated diet was based on corn and soybean meal and 0, 100, 200 or 400 mg of oregano oil per kg of feed were incorporated in the diets of treatment 1, 2, 3 and 4, respectively. Feed intake, weight gain, feed conversion and mortality rates were weekly recorded. At 21 and 42 days of age the intestinal villi height and antioxidant capacity in the chicken breast were measured. Oregano oil used contained 43.17% and 29.16% of thymol and carvacrol, respectively. Feed intake, weight gain, feed conversion rate and mortality were not affected by oregano oil dietary supplementation. The height of intestinal villi increased with the level of oregano oil supplementation (P

austral journal of veterinary sciences

Effect of oregano oil dietary supplementation on production parameters, height of intestinal villi and the antioxidant capacity in the breast of broiler