Judgement of hygienic quality of roughage in horse stables in Switzerland.

The research article investigates the hygienic quality of roughage, which is used as feed and bedding for horses, on 46 farms across Switzerland. In particular, it checks for bacterial load, yeast, mold, low-density lipoprotein (LPS), and a toxin called deoxynivalenol (DON). Results revealed that straw generally had lower hygienic quality than hay and silage.

Study Method

• The study was conducted on 46 horse farms across Switzerland where researchers studied the hygienic quality of the roughage used.
• The research team conducted both a macroscopic examination and microbial counts to review the quality of the materials. In addition to counting the number of bacteria, yeasts, and molds, the team tested for the presence of harmful substances such as lipopolysaccharides (LPS) and deoxynivalenol (DON), a contaminating toxin.
• The dry matter (DM) content was also considered in all roughage and pH was measured specifically in silages (fermented coarse fodders).

Key Findings

• Straw used on the farms was found to have a lower hygienic quality compared to hay and silages, indicating a higher presence of bacteria and other potentially harmful substances.
• The quantity of LPS was significantly higher in straw compared to hay samples. LPS are harmful compounds found on the outer membrane of certain bacteria, which can cause health issues in horses if consumed in large amounts.
• The macroscopic examination further supported that straw has a lower hygienic quality, as seen by the higher microbial counts.
• Eight straw samples and one hay sample were found to be contaminated with DON, a harmful mycotoxin that can cause illness in horses if consumed.
• Despite high levels of dry matter and pH, silages maintained a high standard of hygienic quality.
• Overall, hay exhibited better hygienic quality than straw, indicating it might be a safer choice both for horse feeds and bedding.

Implications

• The study concludes by recommending that the hygienic standards of straw be considered when using it as horse bedding material, owing to its lower hygienic quality compared to other types of roughage such as hay and silage. Attention to hygienic quality can help prevent health issues in horses caused by exposure to harmful bacteria and toxins.