Most butyric acid–producing bacteria ferment glucose, hexose, pentose, and oligo- and polysaccharides and form acetic acid in addition to butyric acid as their major fermentation products.
Butyric acid occurs in milk, and butter contains 3.3 percent butyric acid. Butyric acid and other shot-chain fatty acids are taken up by the intestine to be use for energy. Butyric acid is an important energy source of the cells lining the colon, where it seems to assist their normal development and maintainance.
Saturated fatty acid: Butyric acid