EN
The aim of the studies was to compare the Ht values and the content of Hb in blood, total protein. Na, K, Ca, inorganic P and Mg in blood serum and bone tissue in lambs born in different seasons. A higher (P≤0.05) Ht value, K and Ca content, and a lower total protein, Na, inorganic P and Mg content were found in the blood of lambs born in autumn. A higher (P≤0.05) content of Ca and Mg, but a lower of Na, K, and inorganic P were found in the bone tissue of lambs born in autumn compared to the content of those elements in spring born lambs. The type of lambs’ birth was of no effect on the content of macroelements examined in their bone tissue. No differences were found in Hb content and body weight in lambs born in selected seasons.