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Intestinal microbiota plays an important role in gut functions and host metabolism; however, it is unclear whether selection for rapid growth has affected intestinal microbiota. The objective of the study was to determine the effects of genetic selection on intestinal microbiota in broiler chickens.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Heritage (Athens Canadian Random Bred: ACRB), slow- and fast-growing (SG, FG) chickens were raised under similar conditions for 35\u00a0d. 16S rRNA sequencing was performed on ileal and cecal luminal (IL-L and CE-L, respectively) and mucosal bacterial populations, and data were analyzed using the qiime2 platform, differential abundance, and metabolic pathways.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The relative abundance of the genus\n                      <jats:italic>Turicibacter<\/jats:italic>\n                      was elevated (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.05) at hatch compared to 48\u00a0h before hatch; while at species level,\n                      <jats:italic>Clostridium celatum<\/jats:italic>\n                      was increased (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.05) at hatch. During the post-hatch period, body weight was higher in the SG and FG groups than in the ACRB group at each time point from d 13 to 35. In IL-L, richness (d 14) was lower (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.05) in ACRB compared to FG and SG lines, respectively. In CE-L, richness and Shannon index were reduced (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.05) in ACRB compared to FG lines only on d 35. The Shannon index was significantly (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.05) lower in ACRB birds compared to FG birds on d 35. The relative abundance of genus\n                      <jats:italic>Escherichia<\/jats:italic>\n                      was higher (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.05) in SG compared to other lines. FG birds were characterized by the highest (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.05)\n                      <jats:italic>Streptococcus<\/jats:italic>\n                      level. Relative abundance of most of the identified species were affected only by time post-hatch and only the relative abundance of a single species\n                      <jats:italic>Lactobacillus salivarius<\/jats:italic>\n                      was higher (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.05) in FG compared to ACRB birds. Predicted metabolic pathways related to biosynthesis of nucleotides and biotin, especially in the cecum, were increased in SG lines.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>These results indicate that selection for growth has affected intestinal microbiota as bacterial diversity was different in the ileum and cecum which could partly explain growth rate differences among heritage and modern lines. In addition, the increased predicted metabolic pathways in the ileum of SG birds could positively affect growth rate, and further research is needed to elucidate this hypothesis.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s40104-026-01360-8","type":"journal-article","created":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T00:03:12Z","timestamp":1772841792000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Effects of selection on production parameters and intestinal microbiota in heritage and modern broiler chickens"],"prefix":"10.1186","volume":"17","author":[{"given":"Kouassi R.","family":"Kpodo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lori L.","family":"Schreier","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katarzyna B.","family":"Miska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Monika","family":"Proszkowiec-Weglarz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,3,7]]},"reference":[{"key":"1360_CR1","doi-asserted-by":"crossref","unstructured":"Le Bihan-Duval E, Alnahhas N, Pampouille E, Berri C, Abasht B. 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