Associação de variáveis climáticas em granjas de frango de corte quanto ao desenvolvimento de fungos.

Abstract

Climate and presence of aggressive agents in agricultural buildings depends on variety of factors, such as building features, confined animal species and climate variables. In determined conditions, however, its possible microorganism s development, which the most frequent are fungi, affecting, in this way, the air quality; one of the basic requirements to warrantee good productivity. The aim of this work, carried out in Rio Claro, São Paulo state, Brazil, was evaluate the colonies forming units per m³ (CFU/m³) distribution standard in different poultry house s typologies, one counting with conventional ventilation system (G1), and another one equipped with tunnel ventilation system (G2), as well the external region between those buildings (EXT), and correlate those data with environmental variables (dry bulb temperature DBT, relative humidity RH and air velocity AV). In this way, were, during three production flocks, weekly, collected environmental data and air samples, using a personal air sampling pump. In general, the statistical analysis showed that, isolated, environmental variables were not significant, at 0,05 significance level, to CFU/m³ incidence, with exception to DBT in G1 and RH in EXT (p-value≤0,05), both of these correlations presented a negative association.