Yokus, Beran Effects of seasonal and physiological variations on the serum major and trace element levels in sheep. [electronic resource] - Biological trace element research Dec 2004 - 241-55 p. digital Publication Type: Journal Article ISSN: 0163-4984 Standard No.: 10.1385/BTER:101:3:241 doi Subjects--Topical Terms: AnimalsDietEstradiol--bloodFemaleLactation--physiologyMalePregnancyProgesterone--bloodSeasonsSheep--metabolismSpectrophotometry, AtomicTrace Elements--metabolism