Grass is best for beef and the environment, says National Trust.
D000822:Animal Husbandry / Q000379:methods* / Q000592:standards; D000818:Animals; D002417:Cattle / Q000378:metabolism / Q000502:physiology*; D004777:Environment; D006801:Humans; D008460:Meat / Q000592:standards*; D006109:Poaceae