Caecal microbiota in horses with trigeminal-mediated headshaking.

The caecal microbiota of horses with TMHS was similar to control horses in terms of diversity but differed significantly with Methanocorpusculum spp. having higher abundance in horses with TMHS.  CONCLUSIONS AND CLINICAL IMPORTANCE: Methanocorpusculum spp. was more abundant in the cecum of horses with TMHS. However, its role in disease is unknown. Furthermore, it could also represent an incidental finding due to our small population size.