Efeito da desinfecção de nascedouros com ácido peracético e compostos quaternários de amônia associado a glutaraldeído sobre a mucosa traqueal de pintos de um dia

Abstract

This study aimed at identifying lesions in the respiratory tract of chickens caused by hatchers disinfection, performed by micro-sprinkler with peracetic acid and ammonia associated with glutaraldehyde. The experiment was conducted in a hatchery in Uberlândia - MG, in June 2013. Three treatments were performed, one treatment for hatcher, considering all hatchers were in the same room and had the same mechanisms of temperature, humidity and ventilation control. The treatments were: hatcher spraying with a solution of peracetic acid diluting two ml per liter of water 300 ppm (T1) hatcher spraying with a solution of ammonia associated with glutaraldehyde diluting one ml of water per liter - 75 e 450 ppm (T2) and spraying water (T3 or control). At the end of 48 hours, 16 chicks per treatment were collected in the hatcher. Each trachea was divided into three samples. A sample was fixed and processed for evaluation through light microscopy, another sample was processed for evaluation through transmission electron microscopy and the last fragment was analyzed right after its collection through cilioestase method for cilia movement evaluation. There was a significant difference only in the material evaluated by light microscopy between chicks exposed to environmental ammonia and glutaraldehyde (T2) related to the control group (T3), considering that these chicks showed more severe injuries, such as areas with less cilia and areas of tracheal mucosa flaking. Chicks exposed to disinfection with peracetic acid in hatchers did not show lesions of the tracheal mucosa. Therefore, when using dosages of this study, the peracetic acid is the disinfectant which best replaces the formaldehyde to reduce contamination in commercial hatchers environments in hatcheries, considering the emergence of some possible tracheal lesions.