Diet-Dependent Modular Dynamic Interactions of the Equine Cecal Microbiota

Area of Science:

• Microbiology
• Animal Science
• Systems Biology

Background:

• Dynamic interactions within gut microbiota are crucial for understanding bacterial roles.
• Horse cecal microbiota plays a significant role in digestion and nutrient absorption.

Purpose of the Study:

• To develop comprehensive dynamic models of the horse cecal microbiota.
• To investigate the impact of diet on microbial dynamics, carbohydrate metabolism, and short-chain fatty acid production.

Main Methods:

• Time-series analysis of cecal contents from four cecum-cannulated horses.
• Crossover experiment with starch-rich (barley-supplemented hay) and fiber-rich (hay only) diets.
• Shotgun metagenome sequencing to analyze microbial communities and metabolic pathways.

Main Results:

• Distinct microbial dynamic interaction patterns were observed between the two diets.
• Microbial fluctuations and interactions were more pronounced in horses fed the starch-rich diet.
• Diet-induced changes in cross-feeding networks were identified, linking fermentation to specific carbohydrate types.

Conclusions:

• Diet composition significantly influences not only the composition but also the dynamic interactions and metabolic cross-feeding of the horse cecal microbiota.
• Understanding these dynamics is essential for managing equine gut health and nutrition.
• Dynamic modeling provides a powerful tool for dissecting complex microbial ecosystems.