Avaliação de diferentes concentrações de óxido de cálcio e a associação com ácido peracético sobre a atividade antibacteriana em Salmonella Heidelberg em cama de aviário de frango de corte

Abstract

Salmonella Heidelberg is a pathogenic bacterium that has been proving to be a major sanitary problem for poultry farming. Thus, the present work seeks to evaluate the antibacterial action of different concentrations of calcium oxide (lime) in association or not with peracetic acid (AP) on S. Heidelberg. For this, the experiment was carried out in vitro with an autoclaved aviary bed, where S. Heidelberg was inoculated in the proportion of 1.5 x 108 CFU / mL (colony forming units). For this experiment, 8 treatments were used with 50 g bed in each one of them being: T1 1% lime, T2 2%, T3 3%, T4 1% lime + 3% AP, T5 2% lime + 3% AP, T6 3% lime + 3 % AP, T7 one control without lime and AP, T8 one control only with inoculated bed. This experiment was kept in a temperature controlled oven at 37 ° C for microbial growth at a stipulated time of 12 days. During this period, samples were collected from the experiments, on the day of the experiment and then at 4, 8 and 12 days, totalizing 64 samples. In all samples, 5 g of bed were collected and sent to the laboratory for analysis of the presence or absence of Salmonella Heidelberg. PH measurements were made on the second day after the experiment was set up and after the last 12 day collection. The use of virgin lime in the concentration from 1% was effective, due to the increase of pH and decrease of humidity, and the association with peracetic acid did not show differences in results, where the samples were also similar to lime. With this we can say that for the action of calcium oxide as an antibacterial agent we must use dosages above 1%, always weighing the bed of aviary to verify its weight.