Currently, the national and international markets are stressing actions for environmental preservation, including data collection regarding concentrations or emission of harmful gases generated from animal production. The lack of information regarding this subject is the reason for this study which is to diagnose the concentrations of carbon monoxide and carbon dioxide associated with the thermal comfort of broiler chickens in poultry houses. Two different types of air renovation for heating were studied: ventilation by negative pressure and by positive pressure, during winter in the southern region of Brazil. For evaluation of the thermal environment, randomized blocks were used in split-plot design with two repetitions. The index of the black globe's temperature and humidity indicated the best conditions for thermal comfort environment in the first week of the life of the birds for positive pressure of the system. The highest gas concentrations were detected in the morning for both air renovation methods, with concentrations within the acceptable levels for good bird development.
thermal comfort; carbon monoxide; carbon dioxide; broiler production
