| dc.description.abstract | Background: Early gut microbial colonization is important for postnatal growth and immune development of
the chicken. However, at present, commercial chickens are hatched and raised without adult hens, thus are cut off
from the microbiota transfer between hens and chicks. In this study, we compared the gut microbiota composition
between hen-reared and separately reared chicks, and its impact on the resistance to H9N2 avian influenza virus, with
the motive of investigating the impact of this cutoff in microbiota transfer.
Results: We used the 16SrRNA sequencing method to assess the composition of the gut microbiota in chicks rep-
resented by three hen-reared groups and one separately reared group. We found that the diversity of gut microbes
in the chicks from the three hen-reared groups was more abundant than in the separately reared group, both at the
phylum and genus levels. Our findings highlight the importance of early parental care in influencing the establish-
ment of gut microbiota in the early life of chicks. SourceTracker analysis showed that the feather and cloaca micro-
biota of hens are the main sources of gut microbiota of chicks. After H9N2 exposure, the viral infection lasted longer
in the separately reared chicks, with the viral titers in their oropharyngeal swabs being higher compared to the
hen-reared chicks at day 5 post-infection. Interestingly, our results revealed that the gut microbiota of the hen-reared
chicks was more stable after H9N2 infection in comparison to that of the separately reared chicks.
Conclusions: Microbiota transfer between the hens and their chicks promotes the establishment of a balanced and
diverse microbiota in the early life of the chicks and improves microbiota stability after H9N2 challenge. These findings
advance our understanding of the protective role of gut microbiota in the early life of chicks and should be instru-
mental in improving chick rearing in the commercial poultry industry. | en_US |
