[Seasonal and national differences in the selenium supply of horses across Europe].

The research article investigates the differences in the supply of selenium to horses across various parts of Europe, which was discovered to be dependent on the selenium content in the soil of individual regions, proximity to the ocean, and regional horse-keeping and feeding practices.

Research Methodology and Sample

• The researchers collected serum samples from 137,152 horses across Europe over a six-year period, sent by veterinarians to IDEXX Vet Med Labor.
• These samples were then analyzed for selenium concentration using ICP-analytic. This technique allowed the researchers to establish and compare selenium levels in horses in different regions.

Key Findings

• Selenium supply to horses was found to be heavily influenced by the selenium content of the soil in different regions. Countries near the ocean provided a better selenium supply to horses than those in central Europe, with Denmark and the Netherlands showing the highest supply.
• Notably, Austria and Luxembourg reported the lowest selenium values. Within a single country, selenium supply could vary significantly, as demonstrated in Germany, where western areas showed a better supply than eastern states.
• Central Austria was particularly poor in selenium provision with more than 50% of horse samples revealing an undersupply. This points to the need for better horse-keeping and feeding measures to improve selenium intake in such deficient areas.

Conclusions and Implications

• In view of the varied selenium concentrations in pastures, hay, and silage, and the lack of routine mineral content food analysis, the researchers stress the need for precise management measures to adapt the intake of minerals.
• Annual serum analyses of selenium in horses were recommended to monitor selenium levels.
• In cases of undersupply, selenium should be supplemented with mineral food to ensure the horses receive the necessary nutrients for their health and well-being.