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A veterinary cerumenomic assay for bovine laminitis identification
João Marcos G Barbosa1, Ana Luiza Reis R Cunha2, Lurian C David2
1Laboratório de Métodos de Extração E Separação (LAMES), Instituto de Química (IQ), Universidade Federal de Goiás (UFG), Campus II - Samambaia, Goiânia, GO, 74690-900, Brazil. joaomarcosquim.ufg@outlook.com.
Veterinary Research Communications
|December 5, 2023
Summary
This study introduces a novel, non-invasive earwax analysis (cerumenomic assay) for detecting bovine laminitis. The assay identifies specific volatile metabolites, offering a new diagnostic tool for this costly animal welfare issue.
Area of Science:
- Veterinary Medicine
- Metabolomics
- Animal Health
Background:
- Bovine laminitis poses significant animal welfare and economic challenges globally.
- Current understanding of laminitis's metabolic pathways and inflammatory mechanisms is limited, hindering diagnostic development.
- Cerumen (earwax) analysis (cerumenomics) offers a novel, non-invasive approach for veterinary diagnostics.
Purpose of the Study:
- To develop a non-invasive, accurate, and sensitive veterinary cerumenomic assay for bovine laminitis identification.
- To detect metabolic disturbances in the volatile metabolome of cattle affected by laminitis.
- To identify novel cerumen volatile metabolites as potential biomarkers for early laminitis diagnosis.
Main Methods:
- Collected earwax samples from 20 Nellore cattle (10 healthy, 10 with laminitis).
- Utilized Headspace/Gas Chromatography-Mass Spectrometry (HS/GC-MS) for volatile metabolite analysis.
- Applied two multivariate approaches (semiquantitative and semiqualitative) for biomarker selection.
Main Results:
- Identified specific cerumen volatile metabolites as candidate biomarkers for bovine laminitis.
- The semiquantitative approach highlighted p-cresol with high diagnostic accuracy (AUC: 0.845).
- A panel of eight volatiles, including formamide, showed excellent diagnostic performance in the semiqualitative approach (AUC: 0.97).
Conclusions:
- This study presents the first veterinary cerumenomic assay for bovine laminitis.
- The assay successfully identified novel, altered metabolites associated with the inflammatory condition.
- This research paves the way for developing early diagnostic methods for bovine laminitis through cerumen metabolite monitoring.
