Table 3.

Light phase thermal biology parameters of control and tailless mice acclimated to 22°C or 30°C

	Control	Tailless	Control	Tailless
	22°C		30°C
n of mice	5	6	5	6
n of data points in data set	585	702	725	870
TlcEE, °C	28.92 ± 0.19	28.43 ± 0.15	28.60 ± 0.01	28.19 ± 0.20
Tbinc, °C	28.74 ± 0.33	28.69 ± 0.18	27.69 ± 0.19	27.92 ± 0.01
Tlccond, °C	28.70 ± 0.21	27.95 ± 0.22	28.19 ± 0.22	28.00 ± 0.02
TEE, at TlcEE, kcal/h	0.221 ± 0.004	0.233 ± 0.008	0.230 ± 0.008	0.230 ± 0.008
Cond, <Tlccond, kcal·h−1·Δ°C−1	0.0335 ± 0.0012	0.0334 ± 0.0010	0.0310 ± 0.0022	0.0290 ± 0.0014
Tb, <Tbinc, °C	35.27 ± 0.08	35.31 ± 0.11	35.15 ± 0.08	35.30 ± 0.16
defended Tb, °C	36.20 ± 0.47	35.43 ± 0.44	37.86 ± 0.41	36.85 ± 0.52
TEE Slope, <TlcEE, kcal·h−1·°C−1	−0.0304 ± 0.0013	−0.0334 ± 0.0013	−0.0248 ± 0.0006	−0.0266 ± 0.0009
Tb Slope, >Tbinc <Tb_R, °C Tb/°C	0.256 ± 0.030	0.391 ± 0.023	0.272 ± 0.021	0.345 ± 0.024
Cond Slope, >Tlccond <Cond_R, kcal·h−1·Δ°C−1·°C−1	0.0063 ± 0.0004	0.0044 ± 0.0003	0.0061 ± 0.0003	0.0055 ± 0.0001
TEE_R, °C	33.78 ± 0.37	33.68 ± 0.02	35.24 ± 0.39	34.50 ± 0.34
Tb_R, °C	32.85 ± 0.16	33.21 ± 0.23	33.31 ± 0.15	33.29 ± 0.19
Cond_R, °C	33.47 ± 0.24	33.36 ± 0.13	35.83 ± 0.11	35.33 ± 0.06
TEE Slope, >TEE_R, kcal·h−1·°C−1	0.0275 ± 0.0058	0.0299 ± 0.0027	0.0181 ± 0.0037	0.0178 ± 0.0027
Tb Slope, >Tb_R, °C Tb/°C	0.841 ± 0.033	0.776 ± 0.035	0.728 ± 0.049	0.684 ± 0.029
Cond Slope, >Cond_R, kcal·h−1·Δ°C−1·°C−1	0.0131 ± 0.0007	0.0141 ± 0.0006	0.0296 ± 0.0014	0.0267 ± 0.0006
Body wt, g	29.78 ± 1.37	27.97 ± 1.00	31.32 ± 1.44	30.47 ± 0.84
Age, wk	33	33	28	28

Data are means ± SE (see materials and methods and Fig. 2). Parameters were calculated from analysis of total energy expenditure (TEE), body temperature (Tb), and conductance as a function of ambient temperature (Ta) by mixed model segmented linear regression. Cond Slope, >Cond_R, conductance vs. Ta slope for Ta >Cond_R; Cond Slope, >Tlc_cond <Cond_R, conductance slope in the region >Tlc_cond and <Cond_R; Cond, <Tlc, mean conductance at Ta <Tlccond; Cond_R, second breakpoint of the conductance vs. Ta graph; defended Tb, X intercept of TEE vs. Ta line (using only Ta <Tlc_EE); Tb Slope, >Tb_R, Tb vs. Ta slope for Ta >Tb_R; Tb Slope, >Tb_inc <Tb_R, Tb slope in the region >Tb_inc and <Tb_R; Tb, <Tb_inc, mean Tb at Ta < Tb_inc; Tb_R, second breakpoint of the Tb vs. Ta graph, where Tb starts to steeply rise with Ta; Tb_inc, Ta above which the Tb first increases; TEE at Tlc_EE, mean TEE at Ta = Tlc_EE; TEE Slope > TEE_R, TEE vs. Ta slope for Ta >TEE_R; TEE Slope, <Tlc_EE, TEE vs. Ta slope for Ta <Tlc_EE; TEE_R, breakpoint of the TEE vs. Ta graph, where TEE starts to rise with Ta; Tlc_EE, lower critical temperature, the (first) breakpoint of the TEE vs. Ta graph; Tlc_cond, lower critical temperature, the (first) breakpoint of the conductance vs. Ta graph.