Blood Response to Mercury Exposure in Athletic Horse From Messina, Italy.
Authors: Fazio Francesco, Cicero Nicola, Piccione Giuseppe, Giannetto Claudia, Licata Patrizia
Journal: Journal of equine veterinary science
Summary
# Editorial Summary This investigation examined blood mercury (Hg) concentrations in 20 athletic horses housed at a sports facility in the Milazzo region of Sicily, an area with documented environmental contamination from multiple toxic substances, with the aim of establishing whether Hg bioaccumulation posed a health risk to working equines. Researchers measured Hg levels in whole blood and serum samples using direct mercury analysis (DMA-80), alongside a comprehensive haematological profile including red and white blood cell counts, haemoglobin, haematocrit, and platelet measures; statistical analysis employed paired t-tests with Tukey's post-hoc comparisons (significance threshold P < 0.05), and Hg was additionally quantified in hay and water samples provided to the animals. Whole blood Hg concentrations were significantly elevated compared with serum values, with strong positive correlation between the two matrices (r = 0.99; P < 0.0001), though all measured Hg levels—in blood, serum, feed, and water—remained below established safety benchmarks, effectively excluding acute toxicological risk. These findings offer reassurance for equine professionals managing performance horses in potentially contaminated regions; however, the study's cross-sectional design and modest sample size limit conclusions about long-term subclinical effects or chronic low-level exposure, particularly regarding neurological function in young stock where mercury's teratogenic potential is most concerning.
Read the full abstract on PubMed
Practical Takeaways
- •Hematological profiles can serve as biomarkers to monitor mercury bioaccumulation in athletic horses exposed to contaminated environments
- •Even in geographically polluted regions, current feed and water sources for sport horses in this study did not pose detectable mercury toxicity risks, though continued monitoring is warranted
- •Blood mercury concentration is a more sensitive indicator than serum mercury for assessing systemic mercury exposure in equine patients
Key Findings
- •Mercury concentrations in blood samples were significantly higher than in serum samples (paired t-test, P < 0.05)
- •Blood and serum mercury levels showed strong positive correlation (r = 0.99; P < 0.0001)
- •Mercury levels in blood, serum, hay, and water samples from athletic horses were all below established safety benchmarks
- •No toxicological risk for mercury exposure was identified in horses at the sport center despite location in a heavily polluted area