adaptable agricultural agriculture animal-husbandry appearance bos bos-taurus bovine breed breeders butterfat-producer calvers cattle commercial cow dairy dairy-breed dairy-cattle dairy-cow docile domesticated-ungulates farming fawn fertile field fodder grass grazer grazing green herd high-milk-yields livestock longevity milk-production milkers milking-cows paddock pasture productive quality reproductivity ruminant ruminating rural small-breed solid ungulates versatile