Table 5. Effect of energy level and dietary beet pulp on hair cortisol levels of growing-finishing pigs under heat stress conditions

Temperature (T)	TN		HS				SEM	p-value
ME (kcal/kg) (E)	3,300		3,300		3,450			3,300			HS
Fiber level (F)	Low	High	Low	High	Low	High		T	F	T × F	E	F	E × F
Phase 1 (d 0–28) (pg/mL)
Cortisol	14.09	13.37	22.23	22.73	22.39	20.17	0.68	< 0.001	0.940	0.674	0.384	0.534	0.327
Phase 2 (d 29–56) (pg/mL)
Cortisol	20.53	21.26	29.04	27.69	29.63	26.59	0.60	< 0.001	0.806	0.406	0.833	0.079	0.487

TN, thermoneutral (21°C–24°C); HS, heat stress (30°C–34°C); ME, metabolizable energy.