Usually it's from a sudden switch from a high-fibre diet to one that is low in fibre and high in energy and protein, like switching cows from a hay-only diet to a fresh pasture. The grass that cows eat get digested in the rumen, and the by-product that does not get used or is not needed are expelled as feces.
They eat grass and their feces is nutrient rich which is often used to increase productivity of pastures or fields.
NO.
Some animals is yes like cows horses sheep and goats. The make up of faeces is decided upon by the food intake
Cows
No. Cows EAT grass. They do not "have" grass.
They keep the grass down without the farmer having to turn on a tractor and hook up a mower to mow the grass him or herself. While he or she's got cows eating the grass, the farmer can be free to do other things that need to be done. Plus the grass benefits from the grazing cows, enabling the grass to grow more healthier when it is being grazed; the feces and urine from the cows also aid in grass growth. The deposition of manure leaves the farmer one less job to do as well; he/she doesn't need to spread manure that would've otherwise accumulated in the drylot if he/she had to feed the cows in a drylot instead of having them get their on food out on the pasture.
Horses, cows sheep etc mainly eat grass and a few weeds so the manure can contain grass ... Due to the relatively lower level of proteins in vegetable matter, herbivore manure has a milder smell than the dung of carnivores or omnivores
cows eat grass
Cows will eat long grass. Haven't you ever heard, "The cow's in the corn?" Corn is a tall grass.
Yes if its eaten and digested by a grass eating animal
Cows