Rodent Necropsy
Rodent Necropsy - Related Videos
21:15
Diagnostic Necropsy and Tissue Harvest
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2016
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN Many animal experiments rely on final data collection time points that are gathered from the harvesting and testing of organs and tissues. The use of appropriate methods for the collection of organs and tissues can impact the quality of the samples and the analysis of the data that is gleaned for the testing of the tissues. The method of euthanasia of the animal can also impact the quality of...
09:13
Diagnostic Necropsy and Selected Tissue and Sample Collection in Rats and Mice
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Cited by 49 •
2011
This article describes the procedures for conducting a basic postmortem examination of a mouse or rat, and the collection of basic organs, as well as more challenging sample types from for histological, microbiological, and PCR evaluation.
06:56
Rabies Necropsy Techniques in Large and Small Animals
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Cited by 2 •
2019
The goal of this protocol is to demonstrate safe necropsy techniques in small and large animals to obtain satisfactory tissue samples for rabies testing.
14:12
Rodent Identification II
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2015
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN Animal records must be accurately maintained to ensure that data collection is correct. Records range from maintaining information on cage cards to having a detailed database with all of the relevant information on each animal. The primary component of recordkeeping is the individual identification of research animals. There are a variety of methods suitable for identifying mice and rats. This...
01:34
Environmental Enrichment for Rodents
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2026
All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Environmental enrichment involves objects and practices that encourage natural behaviors, improve psychological well-being, and promote better welfare in laboratory rodents. Environmental enrichment should be tailored to the...
FAQs
Combining external inspection with dissection provides two complementary levels of evidence. External observations can reveal visible abnormalities or injuries, while examination of body cavities and internal organs exposes findings that may not be apparent from the outside. Considering both types of evidence helps investigators assess overall animal health and interpret disease, developmental, or treatment-related changes more completely.
Sample collection extends visual examination into laboratory-based analysis. Tissue and organ samples may be evaluated through histopathology, microbiology, or molecular analysis, allowing researchers to investigate findings beyond what can be seen during dissection. These results can add evidence about disease processes, treatment-related effects, or experimental outcomes and strengthen interpretation when combined with the postmortem observations.
Standardized observations make findings more consistent and comparable across animals or experimental groups. Careful documentation preserves the details of visible abnormalities, organ findings, and collected samples rather than relying on informal impressions. This improves data quality and helps researchers connect postmortem evidence with study variables, including animal health status, interventions, and measured experimental outcomes.
Visible lesions provide an anatomical reference that can be compared with physiological measurements and microscopic findings. When these evidence types are considered together, researchers can examine whether an observed abnormality corresponds to changes detected at other biological levels. This correlation supports more informed interpretation of disease models, treatment effects, developmental abnormalities, and other experimental observations.
A basic examination begins with external inspection, continues with careful dissection and evaluation of the body cavities, organs, and tissues, and may include collection of samples for further analysis. Throughout the process, observations should be documented systematically. This sequence links direct postmortem findings with later histopathological, microbiological, or molecular investigations.
Rodent necropsy is particularly useful in studies involving disease models, toxicology, and biomedical interventions. It can help researchers assess animal health, investigate causes of death, recognize treatment-related effects, and evaluate experimental outcomes. By connecting anatomical findings with laboratory analyses, the examination provides context for interpreting how a disease process or intervention affected the animal.
A systematic examination supports humane research practices by ensuring that animal deaths, injuries, abnormalities, and health changes are examined rather than overlooked. Consistent documentation also strengthens the reliability of study records and interpretation. Together, these practices help researchers identify relevant findings, evaluate potential treatment effects, and use postmortem information responsibly in biology investigations.