Exposure of horses to biotoxins, phytoestrogens, and pesticides from different feed materials and supplementary feeds.

This article studied the presence and potential health impacts of biotoxins, pesticides, and other contaminants in several types of horse feed sold in Europe. Almost all samples contained various fungal metabolites, with feeds containing lucerne (a common forage plant for horses), particularly processed roughage products, showing high levels of phytoestrogens and plant toxins. Supplementary feeds like grain-based mueslis and mashes were found to have a higher prevalence of pesticide and veterinary drug residues. Despite the detection of potentially harmful substances, the research suggests the contamination levels would not pose an immediate health risk to horses. The study emphasizes the need for routine testing and regulations to ensure equine health and welfare.

Methodology

• The research collected 108 samples from various types of horse feed available in European markets. These feed samples included hay, different processed roughage products, grains, and diverse supplementary feeds.
• The collected samples were then tested for different types of contaminants like mycotoxins, phytoestrogens, pesticides, and veterinary drug residues.
• The contaminant analysis was done using a method called liquid chromatography-tandem mass spectrometry (LC-MS/MS), a highly sensitive and accurate analytical tool often used in screening for contaminants in food and feeds.

Findings

• The results showed presence of multiple fungal metabolites in almost all the samples, with Fusarium toxins being the most prevalent type.
• Processed roughage products like cobs, cubes, flakes, and pellets – especially ones containing lucerne, had higher concentrations of phytoestrogens and plant toxins compared to hay.
• Supplementary feeds like grain-based mueslis and mashes were more likely to contain pesticide and veterinary drug residues than other feed materials.
• Following a risk assessment, it was determined that although some potentially highly toxic substances were present in some feeds, they were at levels that aren’t likely to pose an immediate health risk to horses. These substances included colchicine and monensin which were detected in around 10% to 20% of the tested samples.

Implications and Conclusions

• The study highlights the intricate relationship between biotoxins, chemical residues, and the potential risks they pose in marketed equine feeds.
• There is an urgent need for targeted regulations and routine testing of horse feeds to ensure equine health and welfare.
• The fact that almost all tested samples contained multiple toxins highlights the significance and ubiquity of the issue. This calls for more research and analysis of feed contamination in relation to the overall health outcomes of the horses.