Color enhanced SEM of bacteria present in cow feces. Image width: 8.53 micrometers. Magnification: 11,723x if he image is printed 10 cm wide. Cow (cattle) excrements form the base of manure as a natural fertilizer. The presence of large numbers of bacteria in the feces necessitate the separation of the feces, excrements, manure, from sources of drinking water. In some countries the cow "patties" are dried and burned as fuel.