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Description: Dairy cattle have been given most of their forage by grazing in temperate parts of New Zealand and Ireland, as well as in some southern parts of the United States. Increasingly after 1990, grazing also provided a substantial part of the roughage during the summer months in northern parts of the United States. To the extent the cattle harvest the forage, this management option minimizes investment in equipment and for storing the forage, and labor. Grazing also may optimize use of land that is too steep or otherwise unsuitable for intensively cultivated crops. This photo illustrated pregnant cattle grazing on a heifer raising farm. For optimal use of the forage, the pastures should be grazed intensively until the forage is consumed, at which time the cattle are rotated to another pasture.