Avaliação de microrganismos como probiótico na alimentação de frangos de corte

Abstract

The purpose of this research was to evaluate the effects of the use of a group of microorganisms as probiotic on performance, carcass traits, development of the digestive tract, pH of the tract content, microbiological quality and count in the litter and blood parameters of broiler chickens. A total of 768 one-day-old male chicks of Ag Ross 308 line were used, in a completely randomized design with 6 treatments and 8 replicates of 16 birds per experimental plot. The probiotic used was obtained from a mixture of bacteria belonging to the genera Lactobacillus and Acetobacter (1 x 109 CFU / mL), and different yeast species of the genus Pichia (1 x 108 CFU / mL). The treatments consisted of: T1 – diet without addition of antibiotic growth promoter (negative control); T2 – diet with addition of antibiotic growth promoter (positive control); T3 – diet without addition of antibiotic growth promoter and addition of 0.05% probiotic microorganisms in feed; T4 – diet without addition of antibiotic growth promoter and with addition of 0.1% probiotic microorganisms in feed; T5 – diet without addition of antibiotic growth promoter and addition of 0.05% probiotic microorganisms in drinking water; T6 – diet without addition of antibiotic growth promoter and addition of 0.1% probiotic microorganisms in drinking water. The use of microorganisms as probiotic for broiler chickens at different concentrations and administration did not significantly influence the performance, carcass characteristics, development of the digestive tract, pH of the tract content, microbiological quality and count in the litter. However, a significant difference was observed in the blood parameters for total plasma proteins (TPP) of birds supplemented with antibiotics and with 0.1% of probiotic microorganisms via feed. Considering the results, it can be inferred that microorganisms as probiotic can be supplemented in up to 0.1%, via feed or drinking water, without compromising the development and performance of the animals.