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Scoring of Decomposition: A Proposed Amendment to the Method When Using a Pig Model for Human Studies
Natalie Keough1, Jolandie Myburgh1, Maryna Steyn2
1Department of Anatomy, Forensic Anthropology Research Centre, University of Pretoria, Private Bag x323, Arcadia, 0007, South Africa.
Journal of Forensic Sciences
|December 30, 2016
Summary
Pig decomposition differs from human decomposition, impacting postmortem interval (PMI) estimations. This study developed an amended scoring system for more accurate forensic science research.
Area of Science:
- Forensic Science
- Taphonomy
- Decomposition Biology
Background:
- Pigs are frequently used as human surrogates in decomposition research.
- Existing human decomposition stage models by Galloway and Megyesi lack direct comparison with porcine models.
- Variations in decomposition patterns between pigs and humans can significantly affect postmortem interval (PMI) estimations.
Purpose of the Study:
- To scientifically examine and compare decomposition sequences and rates between pigs and humans.
- To evaluate the applicability of established human decomposition models to porcine subjects.
- To develop an amended scoring system for decomposition studies utilizing pigs.
Main Methods:
- Twenty pigs (50-90 kg) were subjected to decomposition over a five-month period.
- Decompositional features were systematically recorded throughout the study.
- Total Body Scores (TBS) were calculated to quantify decomposition stages.
Main Results:
- Significant differences in early decomposition stages were observed between pigs and humans.
- The study identified specific variations in decompositional features and rates.
- An amended scoring system was developed based on observed porcine decomposition patterns.
Conclusions:
- Current standards for PMI estimation derived from porcine models may require adjustment for direct human application.
- Porcine models remain valuable for investigating factors influencing decomposition.
- Further research is needed to refine the use of porcine models in forensic science.
