animal Animalia Bos taurus Bovida Bovinae browse cattle Chordata cow cows dairy products domestic domesticate farm grass graze livestock mammal milk ungulates Bos taurus Bovida Chordata cattle Aberdeen angus agricultural agriculture Angus animal husbandry Australian beef black angus bos bovine breeders bulls bush commercial farming fertile field fodder grazers graziers grazing herd hills meat production paddock polled profitable reproductivity rural solid taurine cattle chew countryside eat England green hill landscape meadow nature panorama pasture peace peaceful South Downs summer Sussex tranquil animal-husbandry black-and-white breed calvers dairy dairy-breed dairy-cattle dairy-cows dehorned domesticated-ungulates high-milk-yields Holstein-Friesian longevity milk-production milkers milking-cows production quality ruminant ruminating versatile