QUALIDADE FÍSICO-QUÍMICA E EMISSÃO DE AMÔNIA DE CAMAS AVIÁRIAS REUTILIZADAS SUBMETIDAS A DIFERENTES TRATAMENTOS

Abstract

The objective of this study was to evaluate the efficiency of different treatments in reused poultry litter for broiler farming on the physicochemical quality and ammonia emission in the litter used. Six hundred one-day-old Cobb broiler chicks of both sexes were housed in a completely randomized design with six treatments, five replicates and 20 birds per experimental unit. The treatments evaluated were based on biological and/or chemical methods (application of Ca(OH)2), namely: new litter (control treatment) and reused litter treated with flat anaerobic fermentation, anaerobic fermentation by windrow, flat anaerobic fermentation + chemical treatment, anaerobic fermentation by windrow + chemical treatment and chemical treatment. The variables analyzed were the physicochemical parameters (humidity, pH and temperature) and ammonia emission from the litter before the fermentative and/or chemical treatments (untreated litter), after the treatments and at the end of the rearing period. The data were subjected to analysis of variance and the means were compared by the Tukey test at 5% with the aid of the statistical program R (R Core Team®). There was an effect of the treatments on the pH of the litter, where the poultry litters subjected to fermentative and/or chemical treatments presenting a higher pH to the new litter based on wood shavings. Meanwhile, the flat fermentation + lime and lime-treated litter treatments presented levels of volatilized ammonia similar to the new litter. No significant variation was observed for the variable’s humidity and temperature between the treatments.