Scientific papers report a growth in foodborne infections in humans from consumption of poultry products, which led to a greater demand from government agencies and consumer market, increasing the interest in the use of natural and alternative products given to the chicken. In this context, we highlight the good results showed by probiotics. Serotonin is a biogenic monoamine, which is derived from tryptophan and participates in several functions of the gastrointestinal tract and plays an important role in the interaction between the immune, endocrine and nervous systems. In mammals, serotonin is reported with consistence, but there are few studies in birds. This study aims to investigate the effects of serotonin and its precursor, in combination or not with probiotics in the development of intestinal villi and immunity of broiler chickens challenged with Salmonella Enteritidis.
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