Tail skin temperature (TST) changes (mean °C ± s.e.m.) during four challenges.

<p>Significant changes (vs 0) are marked with an asterisk (*). Significant line differences are marked with a dagger (†).TST dropped during startle testing only in LoS rats. Hyperthermic responses to the competition apparatus (Solitary exposure) and to Competition 3 (Early competition) did not differ between lines but were larger in LoS rats during Competition 9 (Late competition). Note: TST response to startle was measured in 23 dyads; they did not differ from the other dyads in the other tests with respect to line effects.