Heart rate and body temperature in separated monkey infants.

Area of Science:

• Primate behavior
• Animal physiology
• Stress response

Background:

• Maternal separation is a significant stressor for infant primates.
• Understanding the physiological impact of separation is crucial for welfare.

Purpose of the Study:

• To investigate the effects of maternal separation on heart rate (HR) and body temperature (BT) in pigtail monkey infants.
• To correlate physiological changes with behavioral responses during separation and reunion.

Main Methods:

• Utilized implantable biotelemetry systems to record HR and BT in ten group-living M. nemestrina infants.
• Collected quantified behavioral data during baseline, separation, and reunion periods.
• Analyzed mean daytime and nighttime HR and BT values.

Main Results:

• Separation initially increased HR and BT, followed by marked decreases, especially during nighttime.
• Behavioral depression indices peaked later in the separation period compared to physiological changes.
• Reunion normalized HR and BT in most infants, but some showed prolonged physiological alterations.

Conclusions:

• Maternal separation induces significant and lasting physiological changes in infant primates.
• Thermoregulatory mechanisms may be impaired during depressive behavior following separation.
• The stress of separation can lead to physiological changes extending beyond the stressor's duration.