Controle da infecção por salmonella enteritidis em frangos de corte com ácidos orgânicos e mananoligossacarídeo

Abstract

The objective of this study work was to evaluate the effect of two organic acids (formic acid and propionic acid) and of one mannanoligosaccharide added to the diet to control the intestinal infection caused by Salmonella Enteritidis in broilers. In these 39 days of study it was used 150 birds, 1-day-old, of the Cobb lineage, both sexes and free of Salmonella Enteritidis. They were divided in 6 different treatments (T) with 25 birds each, where: T1 (diet and no infection), T2 (diet + organic acids + no infection), T3 (diet + organic acids + mannanoligosaccharide and no infection), T4 (diet + organic acids and infection with Salmonella Enteritidis) T5 (diet + organic acids + mannanoligosaccharide + and infection with Salmonella Enteritidis) T6 (diet and infection with Salmonella Enteritidis). After housing, the chicken litter was instilled on the 4th day with Salmonella Enteritidis and every seven days, five birds from each group were killed through cervical dislocation. The necropsy was performed and also the bacteriological exams to detect Salmonella Enteritidis using the feces collected over the chicken litter of the groups bacteriological analysis of the cecal tonsils was done as well. On the 18th day only 60% of birds were infected in treatments T4 and T5; on the 25th day, 40% of birds in T4 and 20% in the T5 were infected; on the 32nd day, 100% of tested samples were negative in both treatments. The T6 group was 100% positive until the 32nd day, but on the 39th day, it got reduced in 20% of the number of infected animals. In the experimental conditions of this study, the organic acids and the mannanoligosaccharide added to the diet possibly contributted to control the infection caused by Salmonella Enteritidis on tested birds.