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The aim of the study was to determine the influence of administering compound feed containing various fructo-oligosaccharides (FOS) on the health of turkeys infected with Hemorrhagic enteritis virus (HEV) and with Salmonella Typhimurium (ST). Investigations were performed on 270 young male BUT-9 turkeys which were divided into three groups (I-III) consisting of 90 birds in each group. Group I received a compound feed without FOS, while group II and III received feed with a 2% addition of chicory fine flour and standard fructo-oligosaccharide from chicory, respectively. At the age of eight weeks 13 birds from every group were injected per os with HE virus at a dose of 104,6EID50/ml. After five days three birds from each group were slaughtered with the aim of defining their susceptibility to HEV and the 10 remaining turkeys were infected with ST: 1 ml of a bacterial suspension PBS with a concentration of 9×109 jtk/ml into the croup. The birds were clinically observed for 12 days. Blood samples were controlled from five birds from each group on days 5 and 12 following infection, after which three of the turkeys were slaughtered, anatomopathologically examined and cuttings of the liver and caecum were collected for bacteriological examination. The results of the study indicate that the turkeys which received feed containing FOS did not succumb to ST infection because, five days following infection, bacteria was isolated only from the caecum, whereas it was additionally isolated from the liver in the case of turkeys who had received feed not containing FOS. The biochemical results from the groups of turkeys fitting within physiological norms and receiving feed containing FOS proves that there was no general ST infection and that FOS do not negatively influence turkeys' organisms. Five days after infection there was an increase of LDH activity in the three groups of turkeys receiving feed without FOS. The results of the study do not unanimously prove that FOS slow down ST infections but they do encourage further research on the issue.
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