This study was designed to evaluate effect of nutrient density of diet, on performance variables of broilers, kept in environments with ventilation, with or without fogging, in periods of eight to 21 and eight to 41 days of age, as well as, to evaluate carcass yield, abdominal fat and cuts at 41 days of age birds. The experimental design was completely randomized in a factorial design, with three treatments and six replications, in two environments, with 20 birds per experimental unit. Treatments consisted of three diets with different nutrient densities: control; medium and high density. The evaporative cooling system with ventilation associated nebulization, on condition of temperature and relative humidity elevated air, provides an increase in feed intake, but worse feed conversion of broilers in the initial phase. For eight to 41 days, environment with ventilation associated fogging provides birds increase in feed intake and weight gain, without affecting feed conversion. Diet high nutrient density, phase eight to 21 days, reduces feed intake and improved feed conversion compared to the control diet. For eight to 41 days, diet of medium density provides greater weight gain and better feed conversion compared to control. Different nutritional levels do not affect carcass yield, abdominal fat and major cuts at 41 days of age.
carcass; energy; heat; performance; poultry