The resident microbiota of poultry presents a great variety of commensal and/or mutualistic microorganisms, which colonize from the crop, permeating through the proventriculus, ventricle, small intestine and its portions (duodenum, jejunum, ileum) and large intestine (cecum, colon, and rectum). They act in the metabolism of nutrients in the diet, generating important metabolites for the balance of the intestina...