The effect of heat stress exposure on the mRNA expression of HO-1 and HIF-1α in jejunum and ileum of chickens fed a control or GOS diet.

<p>Chickens fed a control or GOS (1 or 2.5%) diet for 6 days before being exposed to either control or heat stress conditions for 5 days. The mRNA expression of HO-1 (A, B) and HIF-1α (C, D) in jejunum (A, C) and ileum (B, D) measured by qRT-PCR. Results are expressed as relative mRNA expression (fold of control, normalized to β-actin) as mean ± SEM, n = 6–10 animals/experimental group. Different lower-case letters denote significant differences among groups.