Although the production of good pasture is a starting point, one end point is a prime, healthy animal. lems At Weybridge, we have many animal health probassociated wrth the grazing of apparently good pastures, and it is some of these problems that I propose to discuss this afternoon: Because some of these disorders are not associated with a deficiency of minerals in the herbage itself, it may be misleading to refer to them merely as "trace element" or "mineral deficiency" diseases, which usually implies a deficient intake of some essential dietary constituent rather than a dysfunction of the mineral metabolism of the animal.