Citation: Hj. Boehnke et al., SELENIUM LEVELS IN BOVINE BLOOD IN THE WE SER-EMS REGION AND EFFECTS OF SELENIUM FERTILIZATION OF PASTURE GROUNDS WITH EXTREME SELENIUM DEFICIENCY ON SELENIUM LEVELS IN PLANTS AND BLOOD OF GRAZING YOUNG DAIRY-CATTLE, DTW. Deutsche tierarztliche Wochenschrift, 104(12), 1997, pp. 534-536