Pups, sick animals and those who have undergone surgery, have a strong preference for slightly elevated ambient temperatures and they like a place to hide.

Humidity and ventilation

The animals are also sensitive to large fluctuations in humidity and ventilation frequency. Respiratory disorders (at excessively high humidity) and ringtailRingtail An annular constriction of the tail of a young rodent caused by low relative humidity (ambient air is too dry). (at excessively low humidity) can be associated with such fluctuations. Extremely high and low humidity levels should be avoided, as well as rapid changes in humidity.

UltrasoundUltrasound Sound with a wavelength outside the audible range of the human ear. A ~20 kHz frequency is associated with possible discomfort, a 50 kHz frequency is considered environmentally acceptable. Ultrasound is associated with a state of animal welfare in that animals may emit more when they are stressed. sensitivitySensitivity Awareness of sensations. This includes the response to touch, pressure, varying temperature (heat, cold), light, and awareness of muscle tension (proprioception). Excessive stimulation of the nociceptors causes a sensation of pain. Chemicals can also cause sensory effects.

In addition, rats are very sensitive to high frequency sound (ultrasound). This type of noise has to be avoided, especially while the animals are resting. Electronic equipment in animal rooms can generate this type of disturbance. Albino rats are particularly sensitive to light. Light intensity should be limited to a maximum of 60 lux around these animals.