Orbital sinus blood sampling in rats: effects upon selected behavioural variables

Area of Science:

• Veterinary Medicine
• Animal Behavior
• Anesthesiology

Background:

• Diethyl-ether anaesthesia is commonly used in rodent research.
• Orbital sinus blood sampling is a technique used for blood collection in rodents.
• Understanding the behavioral impact of these procedures is crucial for animal welfare.

Purpose of the Study:

• To investigate the behavioral changes in rats following orbital sinus blood sampling under diethyl-ether anaesthesia.
• To differentiate the effects of anaesthesia alone from the combined effects of anaesthesia and orbital puncture.
• To provide data for the ethical debate surrounding orbital puncture techniques.

Main Methods:

• A Latin square design was used with 12 rats subjected to sham anaesthesia, diethyl-ether anaesthesia, and anaesthesia plus orbital puncture.
• Behavioral monitoring was conducted using the LABORAS method, quantifying grooming, locomotion, and inactivity.
• Data collection occurred during the transition from light to dark periods over 20 hours post-treatment.

Main Results:

• Diethyl-ether anaesthesia reduced grooming duration compared to sham anaesthesia.
• Orbital puncture, superimposed on anaesthesia, significantly decreased locomotion duration and frequency.
• Animals subjected to orbital puncture also showed reduced inactivity.

Conclusions:

• Orbital puncture induces behavioral changes in rats beyond those caused by diethyl-ether anaesthesia alone.
• The observed reduction in locomotion and increase in activity suggest a discernible impact of the procedure.
• These findings offer empirical evidence relevant to the ethical considerations of using orbital puncture in research animals.