The relative humidity (RH) in the rooms was not controlled (i.e. was not kept
constant), but was recorded using the same data logger as for room temperature.
During the adaptation period, animals were exposed to the presence of the experimenter in the pen and to the measurement conditions, to avoid any influence of
the procedures and measurements on the research findings. During the experimental period, Ta and RH in the TN room averaged 24.4 ± 0.4 °C and 52 ± 7%, respectively; the corresponding values in the HT room were 30.5 ± 0.1 °C and 45 ± 5%.