Cows eat fruits and berries yes and oranges apples avacado pits holly pampas grass saw grass and many other plants and invasive species not fit for human consumption.
I cannot eat berry brambles or avacado pits but they can. It is the animal planet.
Intermittent fasting and limeted caloric intake is optimal for a long and healthy life.
I suggest investigating the Dr. Aman Ra regime as seen on youtube
RE: Vegan cow diet challenge