Evaluation of inulin and probiotic for broiler chickens/Avaliacao de inulina e probiotico para frangos de corte

The objective of this work was to evaluate the effects of growth promoter additives (prebiotic, probiotic and symbiotic) as an antibiotic replacement on the performance and carcass characteristics (prime cuts, organs and abdominal fat) in diets for broiler chickens 1 to 42 days old. A total of 384 birds were used, one-day-old, on a reused bed. A completely randomized design was used, with four treatments and six replications, namely: PRO - supplementation with probiotic (2 kg [t.sup.-1]), ANT--supplementation with antibiotics (flavomycin 10%--4 ppm and halquinol 60%--15 ppm), PRE--supplementation with prebiotic (5 kg [t.sup.-1]), SIMB supplementation with probiotic and prebiotic (2 and 5 kg [t.sup.-1], respectively). The probiotic used consisted of Lactobacillus acidophilus, Streptococcus faecium and Bifidobacterium bifidum, and the prebiotic used consisted of inulin (chicory root extract). In the initial phase, the chickens fed diets containing probiotic and symbiotic had higher weight gain and total weight at 21 days. Supplementation with antibiotics in feed provided a lower feed intake at 1 to 21 days old. The growth promoters did not show an effect on the variables of performance, carcass yield and prime cuts studied in the phase from 1 to 42 days of age. Key words: antibiotic, performance, prebiotic, symbiotic. Objetivou-se com este trabalho avaliar o efeito de aditivos promotores de crescimento (prebiotico, probiotico e simbiotico) em substituicao ao antibiotico sobre o desempenho e caracteristicas de carcaca (cortes nobres, orgaos e gordura abdominal), em dietas para frangos de corte de um a 42 dias de idade. Foram utilizados 384 pintos de um dia de idade alojados sobre cama reutilizada. O delineamento experimental utilizado foi o inteiramente casualizado, com quatro tratamentos e seis repeticoes, sendo: PRO suple me ntacao com probiotico (2 kg [t.sup.-1]), ANT--suplementacao com antibioticos (flavomicina 10%-4 ppm e halquinol 60%--15 ppm), PRE--suplementacao com prebiotico (5 kg [t.sup.-1]), SIMB--suplementacao com probiotico e prebiotico (2 e 5 kg [t.sup.-1], respectivamente). O probiotico utilizado era composto por Lactobacillus acidophillus; Streptococcus faecium e Bifidobacterium bifidum e o prebiotico utilizado foi inulina (extrato de raiz de chicoria). Na fase inicial, os frangos alimentados com dietas contendo probiotico e simbiotico tiveram maior ganho de peso e peso total aos 21 dias. A suplementacao na racao com antibiotico proporcionou m