Table 6.

Effects of constant chronic heat stress on microvillus height of small intestine segments in growing-finishing pigs, μm

Items	Treatments			P-value
	TN	HS	PF
Duodenum	1.66 ± 0.06a	1.42 ± 0.04b	1.40 ± 0.09b	0.029
Jejunum	2.74 ± 0.07a	1.91 ± 0.11b	1.94 ± 0.07b	< 0.001
Ileum	2.73 ± 0.14a	2.01 ± 0.13b	2.24 ± 0.12b	0.004

TN, thermal neutral conditions (25 ± 1 °C); HS, heat stress conditions (35 ± 1 °C); PF, pair-fed with HS under TN conditions (25 ± 1 °C). Data are expressed as mean ± SEM (n = 8 for TN and PF, n = 7 for HS). Treatments with different superscript letters were significantly different at P < 0.05