Well, it depends on what species you are referring to (since you have the question posed for not just cattle, but also for goats, sheep and horses), and the quality of the grass or hay. Poor quality grass will take longer to digest than good quality hay, and poor quality hay will take longer to digest than high-quality grass. In ruminants such as sheep, goats and cattle, a low quality forage can starve an animal to death because all it's doing is sitting in the stomach and not doing anything for the animal. It's different for horses, though, as they are able to digest poor quality forage than ruminants because they have a different digestive tract. Horses can digest forage that is high in fibre because it can move through quicker and won't get piled up in the stomach like that will happen with most ruminants.
No. They chew partly digested forage (like grass, hay and silage), not "spit."
When you cut grass in the meadow, this is called mowing the grass and if the grass is to be used for hay it is called mowing the hay or a 'hay mow'.
hay or grass(Y)
pasture grass and hay
cellulose which is present in grass can be digested by ruminants but cannot be digested by humans
all dried grass is called hay. it is where you dry fresh cut grass make it into hay.
Timothy is a grass hay
There is grass in that bundle of hay because that's what was cut and gathered up as hay. A little extra grass in a bale or bundle of hay isn't going to hurt anyone or anything. Pretty sure the cows will enjoy it just as much as there was no grass in the hay you're feeding them.
Hay
Orchard hay is a type of grass hay grown from orchard grass. This type of hay is excellent horse feed, but can be fed to most any grazing animal.
If they were given a choice, they'd choose grass over hay any day. But during the winter months when there is no grass to eat, hay is their primary choice.
grass+fire=hay