AI Article Synopsis
- Saliva is being studied as a way to measure stress biomarkers in calves, particularly during the stressful events of weaning and grouping.
- The research found that several antioxidant and oxidant levels in calf saliva increased significantly after grouping, showing higher measurements compared to their levels right after weaning and two days post-weaning.
- Positive and negative correlations were found between cortisol (which increased) and oxytocin (which decreased) levels in relation to the oxidative biomarkers, suggesting that calves experience a physiological response to stress during this time.
Article Abstract
Background: Saliva is being increasingly used as a sample for measuring biomarkers in several species and shows a high potential of use to detect and monitor stress. The weaning and grouping in dairy calves are a particularly stressful time. Therefore, the objectives of this study were to evaluate a panel of antioxidant and oxidant biomarkers in the saliva of calves on the day of weaning (W0), 2 days after weaning or milk withdrawal (W + 2), and 4 days after grouping (G + 4). In addition, to verify if cortisol and oxytocin concentrations are related to the biomarkers measured.
Results: Salivary cupric reducing antioxidant capacity (CUPRAC), ferric reducing ability of saliva (FRAS), Trolox equivalent antioxidant capacity (TEAC), advanced oxidation protein products (AOPP), and ferrous oxidation-xylenol orange (FOX) were significantly higher (P < 0.02) 4 days after grouping than the day of weaning and 2 days after. The increases were 50 and 54% for CUPRAC, 93 and 116% for FRAS, 117 and 135% for TEAC, 22 and 49% for AOPP and 10 and 5% for FOX in comparison with weaning and 2 days after, respectively. In addition, oxytocin and cortisol showed significant negative and positive correlations (P < 0.05) respectively with the biomarkers of oxidative status.
Conclusions: Our results showed that calves after grouping show increases in antioxidants and oxidants concentrations, indicating that a balance between these molecules has been tried to maintain during this stressful situation. The dynamic changes of biomarkers of oxidative status should be explored and characterised in other stressful conditions.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8642975 | PMC |
| http://dx.doi.org/10.1186/s12917-021-03087-2 | DOI Listing |
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