Effect of FeedingSpores to Broilers Challenged withserovar Heidelberg Brazilian Strain UFPR1 on Performance, Immune Response, and Gut Health.

Abstract

Salmonellosis is a poultry industry and public health concern worldwide. Recently,serovar Heidelberg (SH) has been reported in broilers in Brazil. The effect of feeding a blend of three strains of(PRO) was studied in broilers orally challenged (10CFU/chick) or not with a SH isolated in south of Brazil (UFPR1 strain). Twelve male Cobb 500 broilers per pen were randomly assigned to six treatments in a 3&#x2009;&#xd7;&#x2009;2 factorial experiment where PRO was added at 0, 250, or 500&#x2009;g/ton of broiler feed and fed to either SH-challenged (SH Control, SH&#x2009;+&#x2009;PRO 250, and SH&#x2009;+&#x2009;PRO 500) or non-challenged birds (Control, PRO 250, and PRO 500). Broiler performance, histologic alterations in intestinal morphology,quantification and immune cells counts in liver (macrophages, T CD4+ and T CD8+) were analyzed. Changes in the intestinal microbiota of broilers were also studied by metagenomics for Control, SH Control, SH&#x2009;+&#x2009;PRO 250, and SH&#x2009;+&#x2009;PRO 500 only. Feeding PRO at 250 or 500&#x2009;g/ton reduced SH counts and incidence in liver and cecum at 21&#x2009;days of age. It was observed that PRO groups increased the macrophage mobilization to the liver in SH-challenged birds (&#x2009;<&#x2009;0.05) but reduced these cells in the liver of non-challenged birds, showing an interesting immune cell dynamics effect. PRO at 250&#x2009;g/ton did not affect gut histology, but improved animal performance (&#x2009;<&#x2009;0.05) while PRO at 500/ton did not affect animal performance but increased histologic alteration related to activation of the defense response in the ileum in SH challenged birds compared to control birds (&#x2009;<&#x2009;0.05). SH&#x2009;+&#x2009;PRO 500 group presented a more diverse cecal microbiota (Shannon-Wiener index;&#x2009;<&#x2009;0.05) compared to Control and SH Control groups; while SH&#x2009;+&#x2009;PRO 250 had greater ileal richness (JackkNife index) compared to Control (&#x2009;<&#x2009;0.05). PRO was effective in reducingcolonization in liver and cecum when fed at 250 or 500&#x2009;g/ton to broilers inoculated with SH strain UFPR1. PRO promotes positive alterations in performance (at 250&#x2009;g/ton), immune modulatory effect in the gastrointestinal tract, SH reduction, and intestinal microbiota modulation.