Aims
To evaluate mannan oligosaccharide (MOS) and threonine effects on performance, small intestine morphology and
Salmonella spp. counts in
Salmonella Enteritidis‐challenged birds.
Methods and Results
One‐day‐old chicks (1d) were distributed into five treatments: nonchallenged animals fed basal diet (RB‐0), animals fed basal diet and infected with
Salmonella Enteritidis (RB‐I), animals fed high level of threonine and infected (HT‐I), birds fed basal diet with MOS and infected (MOS‐I), birds fed high level of threonine and MOS and infected (HT+MOS‐I). Birds were inoculated at 2d with
Salmonella Enteritidis, except RB‐0 birds. Chicks fed higher dietary threonine and MOS showed performance similar to RB‐0 and intestinal morphology recovery at 8 dpi.
Salmonella counts and the number of
Salmonella‐positive animals were lower in HT+MOS‐I compared with other challenged groups.
Conclusion
Mannan oligosaccharides and threonine act synergistically, resulting in improved intestinal environment and recovery after
Salmonella inoculation.
Significance and Impact of the Study
Nutritional approaches may be useful to prevent
Salmonella infection in the first week and putative carcass contamination at slaughter. This is the first report on the possible synergistic effect of mannan oligosaccharides and threonine, and further studies should be performed including performance, microbiota evaluation, composition of intestinal mucins and immune assessment.
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