Fig. 5
The heat loss index of the tail during heat exposure in the ovariectomized (OVX) and OVX + estradiol (E2) groups in the light (a) and dark (c) phases, and in the D and P groups in the light (b) and dark (d) phases. The heat loss index is presented as the 1 h average for each ambient temperature (Ta). Data are presented as means ± standard error (n = 5 in each group). §Significant difference between the light and dark phases (P < 0.05). ¶Significant difference from the value at a Ta of 25 °C (P < 0.05). D, control rats in the diestrus phase; P, control rats in the proestrus phase