First, select your breed of cattle from the directory of breeds who have been shown to tolerate living on forage or grazing. Next, you need a management plan which includes rotational grazing and includes the use of strategies to get cows off grain once they get onto it. Low-stress handling is also very important – not just because it's morally better, but because it reduces stress hormones that suppress immunity and reduce energy levels. You can find models online or talk to a number of different people to meld their ideas into one suitable farm model for your needs.