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Eight experiments were conducted to test an oregano-essential-oil-basedproduct (PRO) on performance, gut health, and nutrient absorption capacity inbroilers. The first three, up to 14d and without specific challenges, testedthe effects on intestinal histology, skeletal integrity, and growth. Other twoexperiments, up to 28d birds were challenged to induce feed passage syndrome(STR) and test the effect on the antioxidant status and performance,contrasting later the results under a natural challenge in commercialconditions. Finally, in two other experiments, up to 21 d, birds challengedwith coccidia were tested to determine the effects on coccidiosis, nutrientdigestibility, and feed efficiency (FCR). Corn-soybean-fish meal diets wereused. Under healthy conditions, PRO effects were observed on intestinal villusheight and surface area, mucosa density and structure, villus to crypt ratio,goblet cells density, mucus production, body weight gain, and FCR (P<0.04), andcarcass yield and bone density (P<0.08). Birds affected by STR showed effects(P<0.05) on superoxide dismutase activity, bodyweight gain, FCRE, non-normalfeces frequency, bursal diameter, and dysbacteriosis. Birds affected bycoccidia showed effects on cocci-positive ratio, cocci microscopic score,oocysts count, bursal diameter, body weight gain, FCR, apparent digestibilityof dry matter and crude protein, protein and energy efficiencies (P<0.01), andnitrogen apparent retention (P<0.07). Results showed PRO added value to thediet favoring feed efficiency and performance.

Evaluacion de un producto a base de aceite esencial de oregano sobre la  integridad intestinal, la capacidad de absorcion de nutrientes y el  comportamiento productivo de pollos de carne