If she has water and salt mineral mix along with her hay, then yes she can. It also depends on the hay quality: if she's fed poor quality or low quality hay, she can eventually starve on it, though it'll take a number of months or so.
Yes, so long as it is not too low quality that they won't starve themselves on it, nor too moldy and dusty.
its a type of hay that is good for cows and bulls
yes
Roughages, a good quality grass hay (not alfalfa).
They can, but mostly prefer grass or good hay over straw.
Good enough to be able to tell the difference between dry hay and fresh green grass.
Timothy hay is excellent feed for your cows. It's great for horses and dairy cows due to its high fibre and energy content and low protein content. It's best if mixed with a feedstuff that is high in protein to create a good ration for your animals.
Because they like it.
Hay.
Because they like it.
Yes, but it depends on the quality of the hay and the type of cattle you are feeding. If you are feeding dry brood cows medium-quality hay is good enough to feed them. Younger stock like weaner calves and heifers need a bit higher quality hay and maybe supplementation if they need it. Lactating cows need higher quality hay and feed to keep up with the demands of their calf.
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.
Yes. Hay is THE main staple of any cow's diet when not on pasture.