Abstract
Mother rats maintained on a LD 12:12 photoperiod (lights on 0800 hrs) had longer contact bouts with their offspring during the day than during the night and maternal brain temperature peaked during the night. When the daily temperature cycle was suppressed by removal of adrenal and ovarian hormones, the daily maternal contact cycle was also suppressed. These data are consistent with a thermal model for the limitation of mother-young contact bout duration.
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