Utilização de probiótico na alimentação de frango de corte

Abstract

The objective of this experiment was to evaluate the effect of Bacillus subtilis probiotic on broiler performance. The experiment was carried out at the aviary of the Federal Technological University of Paraná, at the Dois Vizinhos Campus, at the UNEPE of Small Animals. Sixteen 1 sqm boxes containing 15 male one day old Cobb 500 [marca registrada], broiler chicks were used, totaling 240 broilers. The experimental design was completely randomized with four treatments and four replications. The treatments were through the rations supplied to the birds, and treatment 1 is negative control (without inclusion of antibiotic and probiotic); treatment 2 is positive control (including zinc bacitracin); Treatment 3 added Bacillus subtilis (0.01%) from 1 to 14 days of age and Treatment 4 added Bacillus subtilis (0.01%) from 15 to 28 days. Poultry and feeders were weighed weekly to calculate productive performance indexes. At the end of the experiment, the data were submitted to analysis of variance and the means compared by Tukey test at 5% probability. The use of probiotic in the diet at the beginning or after 15 days of age demonstrated higher values of bird weight gain and, consequently, a good feed conversion. However, in the last week (21-28 days), no significant results were obtained in the parameters evaluated between treatments. Thus, the use of the Bacillus subtilis probiotic improves the initial development of the animals, whereas with advancing age and the absence of sanitary challenge, it was shown that the use of this probiotic is not necessary from 21 days of age.