While I cannot fault the moderator becasue the comments were true, there are some other things you need to know about "grass finishing." Cattle do very well on all grass feed. We Americans really made grain an issue when western cattle were "drove" many miles to railheads for shipment. Industries (ok cheap) purveyors of beef in the midwest realized they could make the beef less tough and weigh more, by grain feeding. Also, grain was plentiful and cheap there. We got used to it and liked it...........
Now the other side of the story. Grass fed animals produce much higher Omega 3 and 7 content meat (proven anticarcinogenic and healthier!). Grass fed animals are the least risk for BSE. Grass fed animals do not support mutant Ecoli bacteria, hence are safer in the processing facility. Finally, since most grass fed animals never leave their pastures these days (in the US anyway, Austrailia has it's own problems), they are not tough either. It is possible although not proven that genetics may play a role in tender meat as well.