Not exactly. The plant has to be cut and harvested (along with many other plants of its kind) as hay before it is eaten by cattle as hay. If the plant itself is eaten by a cow and not cut and gathered, it is merely considered fodder or pasture forage, not hay.
No. Cows are herbivores, meaning that they are strictly plant-eating animals, not omnivores nor carnivores. Cows eat grass, hay and silage and should eat just grass, hay and silage.
There are not really "three things" that cows eat, it's more or less the three types of things cows eat. Cows can only eat one thing: plant matter. The three main types of plant matter they eat are fresh green grass, roughage in the form of hay or silage, and grain.
Because they like it.
Because they like it.
Yes.
Yes. Hay is THE main staple of any cow's diet when not on pasture.
Cows do not eat (nor drink) milk. They drink water and eat forages like grass, hay, silage and grains.
Roughages including hay and grass.
They can, but it's not nearly as nutritious as grass or hay.
cows eat grain, grass and hay
Grass, hay and sometimes grain.
Let it relax. The cow won't chew its cud unless it feels unthreatened and comfortable.