Average level of calcium, inorganic phosphorus and magnesium in serum of sheep during the last six weeks of pregnancy, at lambing and three weeks after birth were estimated.
The level of calcium and phosphours reached a minimum concentration three to four weeks before lambing, while the level increased one week before lambing, at lambing and during the puerperium. Magnes ium level shows a marked increase three weeks before lambing, then sharp drop in its level was observed during lambing. Magnesium level returned to its normal level during the puerperium.