Microbial ecology of the equine hindgut during oligofructose-induced laminitis.

The research investigates the bacterial changes in a part of a horse’s digestive system during laminitis, a painful condition affecting the horse’s foot. The researchers found that a certain kind of bacteria, the Streptococcus lutetiensis, proliferates in the horse’s gut before laminitis onset and may be linked to the triggering of the condition.

Research Objective and Methodology

• The main objective of this research was to study the changes in gut bacteria populations that happen during the progression of laminitis, a serious disease in horses, which was induced by oligofructose in this study.
• These bacterial changes were studied and tracked using multiple culture-independent techniques. The researchers also linked these changes to the levels of lactate, volatile fatty acids (VFAs), and certain types of carbohydrates in the caecum, a part of the horse’s digestive system.

Key Findings

• The study found that S. lutetiensis, a type of bacteria, dominates the microbial population in the equine hindgut prior to the onset of laminitis. This suggests that this bacterium plays a significant role in triggering the disease by using the introduced oligofructose to produce large amounts of lactate.
• The researchers also found changes in the populations of lactobacilli and E. coli, but these took place only after the multiplication of S. lutetiensis. As such, the study concluded that lactobacilli and coliforms have no role in inducing laminitis.
• An unidentified, large, rod-shaped bacterium observed during the early stages of laminitis was found to be closely related to the Anaerovibrio genus. The researchers suggest this bacterium may be a novel strain yet to be cultured properly.

Implications of the Study

• Results from the fluorescence in situ hybridization (FISH) and quantitative real-time PCR corroborated the theory that laminitis might be associated with the death and rapid cell breakdown of the S. lutetiensis bacteria. If these bacteria are destroyed, the components released into the system could potentially initiate laminitis.
• These findings can help to better understand the complex equine digestive system and the pathogenesis of laminitis. It could pave the way for better diagnostic, preventative, and treatment strategies for this painful and debilitating condition.