Which description best matches hindgut fermenters such as horses and rabbits?

• A. Hindgut fermentation
• B. Foregut fermentation
• C. Rumen fermentation
• D. Monogastric fermentation

Answer: (A)

Hindgut fermentation describes where microbial digestion happens in the digestive system—the hindgut, specifically the cecum and large intestine—after the stomach and small intestine have done their work. In horses and rabbits, the stomach is simple and digestion continues in the hindgut, where microbes break down fibrous plant material and produce short-chain fatty acids that the animal uses for energy. Rabbits also rely on coprophagy to reclaim nutrients produced during this hindgut fermentation.

Foregut fermentation, by contrast, occurs in the early stomach chambers (like the rumen) of ruminants such as cows and sheep, before digestion reaches the true stomach. The other option, monogastric fermentation, isn’t a precise descriptor of where fermentation happens for these animals. So the description that best matches hindgut fermenters is hindgut fermentation.