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Effects of heat stress on relative mRNA expression of barrier function-related genes of duodenum (A), jejunum (B) and ileum (C) in indigenous broilers (n = 5/group). NT, normal treatment group (21.3 ± 1.2°C, 24 h/day), HS, heat stress group (32.5 ± 1.4°C, 8 h/day). *p < 0.05, **p < 0.01.
