* Cellulose: The main structural component of plant cell walls.
* Hemicellulose: Another type of carbohydrate found in plants.
* Lignin: A complex polymer that provides rigidity to plant cells.
* Proteins: From the digested plant material and some from the cow's own body.
* Fats and Oils: Also from digested plant material.
* Water: A significant component of cow dung.
However, depending on the cow's diet and the environment, there might be trace amounts of metals like:
* Iron: Present in plants, but also can come from soil and water.
* Zinc: Found in plants and soil.
* Copper: Found in plants and soil.
These metals are generally present in very small amounts and aren't a major component of cow dung.
It's important to remember that metals can accumulate in the environment and sometimes end up in the food chain. Therefore, it's always a good idea to be cautious about the source of any food or material that may have been in contact with soil or other potentially contaminated environments.