Yes. They can eat any kind of hay.
There could be a number of reasons: dusty hay, the cattle are not used to eating this type of hay, hay tastes bland or too bitter, etc. To make them eat it you could try pouring molasses over the hay, as the taste of the molasses will encourage cattle to eat the hay.
Watusi's eat grass, just like other breeds of cattle do.
cows eat grain, grass and hay
Grass, and hay, primarily. They are genetically selected to rely solely on grass and hay and not grain.
Yes, but like with cattle, only in moderation.
Whatever hay that grows in your area or in your pastures/hayfields. Shorthorns will eat the same sort of hay that Angus or Simmentals or Limousins will eat, there's no difference in the type of hay to feed in regards to breeds of cattle. As a matter of fact, Shorthorns often will do better on average-quality hay than continentals like Simmental or Limousin will, just like with Angus or Hereford cattle.
Actually that's all they eat. Grass, hay and silage are plant matter that is meant for cattle to eat. Cattle are not omnivores nor carnivores, so they can't eat anything else except plants.
No. As long as the hay is not too moldy, it won't hurt cattle in any way.
Not exactly, no. They will eat the leaves off of trees, though, even if there is grass around, but they don't eat trees like it is their primary food source. The primary food source for cattle is grass in the form of hay, silage and grain.
Cattle like to eat (be it grazing or eating from a feed bunk or hay feeder), sleep, and mate (particularly bulls and cows/heifers that go in heat). That's about it.
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.
They eat normal cattle feed including hay, they will usually be fed a high energy grain such as corn.