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The ventilation in poultry houses controls the concentration of ammonia in the interior; it is responsible for removing excess heat and moisture and reduces dust and gases, providing improvement in the setting of the animals. The objective was to measure the production of ammonia within poultry houses for the use of air conditioning equipment in Belem, Para State. The experimental barns were classified as high technology (AT) medium technology (MT) and low-technology (BT), according to the availability of hoods, fans or any equipment for environmental control, respectively. Data were recorded weekly from the housing, in the same location of the shed, up to 42 days old animals. The ammonia concentration in the treatments at 42 days differed between treatments (P <0.05). AT treatment showed the value of 24ppm, above the limit of 20ppm which is considered prejudicial to birds. The animal performance was not affected by treatments (P <0.05). We conclude that the concentration of ammonia gas produced varied with the degree of technological creation of the warehouses of broilers, being more focused on negative pressure tunnel system, probably exacerbated by high housing density. Although beef production per square meter in the tunnel system was higher than in other production systems, it is recommended to reduce the density, within the recommendations of welfare in the production of broilers.

Produção de amônia no interior de galpões avícolas com modificações ambientais