EN
The aim of the studies was to determine the influence of sex on the level of selected blood haematological and biochemical indices in 5-month-old Polish Longwool lambs. The studies pointed to higher levels of the Ht indices and Hb content (P≤0.01 ), activity of ALT and AST transaminase, Mg, Fe, total iron binding capability and total protein (P≤0.01), and a lower level of Cu (P≤0.01) in the blood serum of male lambs.