FIGURE 2.

Breathing pattern (A,B), oxygen consumption ($\stackrel{.}{V}$O₂) (C,D), air convection requirement ($\stackrel{.}{V}$_E/$\stackrel{.}{V}$O₂) (E,F) and body temperature (Tb) (G,H), during normocapnia and hypercapnia of 14-days-old female and male chickens submitted to the experimental treatments during incubation, i.e., control temperature (CT, 37.5°C), low temperature (LT, 36°C, 6 h/day, from 0 to 5th day) and high temperature (HT, 39°C, 6 h/day, from 0 to 5th day). Values are expressed as mean ± SEM. Different letters represent statistical differences among the treatments. Level of significance: P ≤ 0.05.