Cows playing with straw bales

In the state of Montana in the United States, a breeder films his cows playing with hay bales of 450 kilos. Usually these Hereford cows like to eat and simply rub on haystacks, but obviously this time they decide to make them roll. Excited about their new hobby, the animals seem to have fun like crazy with their new toy to the delight of the breeder, surprised by this unusual scene.