Happy Cows come from California-did not see that

We drove from LA to San Fran and on the way we saw many beautiful green fields of vegetables, vines, apple trees, apricot trees and whatever else they grow in California-it was breathtaking view.  

On the other hand, there were cow ranches with a LOT cows walking around or laying on the ground, and the lack of grass or any type of greenery was disturbing.  Why there was no grass I cannot understand.  How can they say that happy cows come from California?  There was nothing “Happy” about those cows. I am off the beef wagon.