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The handling of the thermal environment in the initial phase of commercial broiler chicken production is fundamental for the zootechnic performance of fowls. This study was done to analyze the thermal environmental comfort and the zootechnic performance of broiler chickens grown in two different half-acclimatized ventilation systems: one with negative pressure and the other with positive pressure, during two complete cycles under winter conditions on southern Brazil. Based on the results of the environmental variables, it could be noticed that, on the first week of life, the temperature averages were below the zone which corresponds to the animal thermal comfort zone, and, the air humidity measurements between 65 and 70% for both treatments, required levels for the poultry comfort. In relation to the poultry productive performance indexes, it was found that all were within the range considered as desirable, relative to the average values obtained by the Brazilian broiler chicken production.

DESEMPENHO PRODUTIVO DE FRANGOS DE CORTE EM DIFERENTES SISTEMAS DE INSTALAÇÕES SEMICLIMATIZADAS NO SUL DO BRASIL