Values of oxygen consumption, evaporative water loss, and body
temperature were plotted as a function of chamber air temperature.
Linear regressions of oxygen consumption at temperatures below the
thermoneutral zone (T_{n}), and evaporative water loss at temperatures
above freezing, were determined with the SAS (1982) GLM procedure.
Lower critical temperature (T_{lc}) was determined graphically from
intersection of the line representing [.H]_{b} and the regression line
representing oxygen consumption below T_{n}. Slopes and intercepts of
regression lines, as well as other mean values, were compared with
_t_-tests (Statistical Analysis System, 1982; Ott, 1984:138-175).
Unless indicated otherwise, data are expressed as mean +- standard
deviation (s.d.).