Fig. 3

Changes in relative bacterial abundance (%) in the ileal content of Jungle Fowl (JF), Athens Canadian Random Bred (ACRB), 1995 Random Bred (L1995), and 2015 Modern Random Bred (L2015) chicken lines raised under thermoneutral (TN) or heat stress (HS) condition (8 h/d; 36 °C) on d 56 at phylum level. A Taxonomic profile of ileal content microbiota. B Effect of ambient temperature on the relative abundance of Proteobacteria. Different letters denote statistically significant (P < 0.05) differences