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. 2021 Jul 22;12:707757. doi: 10.3389/fphys.2021.707757

FIGURE 2.

FIGURE 2

Core body temperature fluctuation during heat stress (HS). (A) Treatments include: (1) control (CTL): birds raised under normal temperature (23°C) from day 29 to 42 and had free access to the diet; (2) cyclic heat stress (CHS): birds exposed to high temperatures (8 h/day at 35°C; from 9:30 am to 5:30 pm) from day 29 to 42 and had free access to the diet; (3) pair-fed (PF): birds raised under the same condition as CTL group, but fed the same amount of feed as CHS group from day 29 to 42. (B) Core body temperature fluctuation during an acute heat stress (AHS). Birds in this group raised under thermoneutral condition (23°C) from day 29 to 42 but exposed to 2 h AHS (35°C) before sampling on day 42. Data are presented as mean ± SEM (n = 8; two birds/pen).