STUDIES OF THE METABOLISM OF BEEF SUCKLER COWS DURING THE OUTDOOR SEASON

Studies of the metabolism of Gelbvieh beef cows indicate a deficiency in the supply of magnesium, calcium, copper and selenium especially du ring their period at pasture, particularly immediately after turn-out. An insufficient intake of minerals, of approximately 20 g per animal per day during the winter months may be the underlying reason for this finding. The incidence of puerperal paresis can be attributed to the deficient supply of calcium and magnesium. The cause of retained place nta could not be explained precisely. The results indicated a tendency between an association between selenium deficiency and the occurrence of retained placenta. At each instance investigated, numbers of eryth rocytes, leucocytes and thrombocytes were normal. It was concluded tha t it is important to improve the intake of magnesium, selenium and cop per by stickler cows through supplementation of rations with minerals. The recommendation is to determine the main and trace element content of the pasture plants and that maintenance feeds in order to prescrib e the content of the supplementation. A preventative approach to the m ain and trace element status of suckler cows can reduce the incidence of physical disorders and sub-optimal production.