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Gastrointestinal studies in the green iguana: technique and reference values
1Department of Pathobiology, Ontario Veterinary College, University of Guelph, Canada.
Summary
This study outlines normal gastrointestinal transit times for green iguanas (Iguana iguana) using barium contrast radiography. Ambient temperature significantly impacts these transit times, with cooler temperatures slowing digestion.
Area of Science:
- Veterinary Radiology
- Herpetology
- Comparative Physiology
Background:
- Gastrointestinal contrast studies are crucial for diagnosing reptilian disorders.
- Normal radiographic anatomy and physiological parameters for green iguanas (Iguana iguana) are not well-established.
- Understanding normal transit times is essential for interpreting contrast studies.
Purpose of the Study:
- To determine appropriate techniques for gastrointestinal contrast studies in green iguanas.
- To establish normal gastrointestinal transit times in healthy green iguanas.
- To describe normal radiographic anatomy of the green iguana gastrointestinal tract.
Main Methods:
- Five healthy green iguanas were used.
- Barium sulfate suspension (25% w/v, 25 ml/kg) was administered via stomach tube.
- Radiographic projections (lateral and ventrodorsal) were taken at regular intervals.
- Animals were maintained at 27-29 degrees C, with temperature effects also investigated.
Main Results:
- Median gastric emptying time was 8 hours.
- Median small intestinal transit and emptying times were 4 and 16 hours, respectively.
- Median large colon transit and emptying times were 15 and 66 hours.
- Reduced ambient temperature significantly increased all measured transit times.
Conclusions:
- Barium contrast radiography is a viable technique for evaluating the green iguana gastrointestinal tract.
- Established normal transit times provide a benchmark for diagnosing disease.
- Ambient temperature is a critical factor influencing gastrointestinal motility in green iguanas.