What nutrients are required by ruminants but not non-ruminants?

Ruminants require specific nutrients such as high levels of fiber, particularly cellulose, which they can effectively digest due to their unique digestive system, including the rumen. They also benefit from volatile fatty acids (VFAs) produced during fermentation in the rumen, which serve as a primary energy source. Additionally, ruminants need specific vitamins, such as vitamin B12, which are synthesized by the microbes in their rumen. Non-ruminants, like pigs and chickens, do not have the same fermentation capabilities and thus have different nutrient requirements.