Perturbation of microbiota in one-day old broiler chickens with antibiotic for 24 hours negatively affects intestinal immune development.
Gut microbial colonization and development of immune competence are intertwined and are influenced by early-life nutritional, environmental, and management factors. Perturbation of the gut microbiome at young age affects the crosstalk between intestinal bacteria and host cells of the intestinal mucosa.



We investigated the effect of a perturbation of the normal early life microbial colonization of the jejunum in 1-day old chickens. Perturbation was induced by administering 0.8 mg amoxicillin per bird per day) via the drinking water for a period of 24 h. Effects of the perturbation were measured by 16S rRNA profiling of the microbiome and whole genome gene expression analysis. In parallel to what has been observed for other animal species, we hypothesized that such an intervention may have negative impact on immune development. Trends were observed in changes of the composition and diversity of the microbiome when comparing antibiotic treated birds with their controls. in the jejunum, the expression of numerous genes changed, which potentially leads to changes in biological activities of the small intestinal mucosa. Validation of the predicted functional changes was performed by staining immune cells in the small intestinal mucosa and a reduction in the number of macrophage-like (KUL01+) cells was observed due to a direct or indirect effect of the antibiotic treatment. We provide evidence that a short, early life antibiotic treatment affects both the intestinal microbiota (temporarily) and mucosal gene expression over a period of 2 weeks.



These results underscore the importance of early life microbial colonization of the gut in relation to immune development and the necessity to explore the capabilities of a variety of early life dietary and/or environmental factors to modulate the programming for immune competence in broilers.
Wageningen Livestock Research, Postbus 338, 6700 AH, Wageningen, The Netherlands. dirkjan.schokker@wur.nl.
Dirkjan
0000-0001-6082-7227
D
Schokker
Wageningen Livestock Research, Postbus 338, 6700 AH, Wageningen, The Netherlands.
Alfons J M
AJ
Jansman
Cobb Europe BV, Boxmeer, The Netherlands.
Gosse
G
Veninga
Gezondheidsdienst voor Dieren, Deventer, The Netherlands.
Naomi
N
de Bruin
Wageningen Bioveterinary Research, Lelystad, The Netherlands.
Stephanie A
SA
Vastenhouw
Wageningen Bioveterinary Research, Lelystad, The Netherlands.
Freddy M
FM
de Bree
Wageningen Bioveterinary Research, Lelystad, The Netherlands.
Alex
A
Bossers
Wageningen Livestock Research, Postbus 338, 6700 AH, Wageningen, The Netherlands.
Johanna M J
JM
Rebel
Wageningen Livestock Research, Postbus 338, 6700 AH, Wageningen, The Netherlands.|Wageningen Bioveterinary Research, Lelystad, The Netherlands.
Mari A
MA
Smits
D000818:Animals; D000831:Animals, Newborn; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D044822:Biodiversity; D002645:Chickens / Q000235:genetics / Q000276:immunology* / Q000382:microbiology*; D005260:Female; D000069196:Gastrointestinal Microbiome / Q000187:drug effects* / Q000276:immunology*; D020869:Gene Expression Profiling; D007150:Immunohistochemistry; D056747:Immunomodulation / Q000187:drug effects*; D008297:Male; D054892:Metagenome; D056186:Metagenomics / Q000379:methods; D059467:Transcriptome
D000900:Anti-Bacterial Agents
Chicken; Gene expression; Gut; Immune development; Microbiota