EN
The aim of the study was to compare haematological and biochemical indices and mineral composition of bone tissue in the 4th and 5th caudal vertebra of 14-day-old Blackheaded (n = 117) and Romney Marsh (n = 100) Iambs (LK < 27 mmol/1) whose mothers had received Vitazol AD₃E and Polfamix "O" from the 60th day of pregnancy. Ht, Hb, MCHC, TSP, urea, ALT, AST as well as Na, K, Ca, Pinorg, Mg were determined in serum and bone tissue. Racial differences in the studied indices were observed, which showed that the Blackheaded lambs had lower value of Ht and Hb (P≤0.01) and higher total protein content, AST activity (P≤0.05) and body weight as compared with the Romney Marsh lambs. No effects of the applied supplements were observed as to the concentration of macroelements in the serum of either breed. On the other hand, the Blackheaded lambs, whose mothers had received Pofamix "O" during pregnancy, demonstrated higher (P≤0.05) concentration of bone tissue calcium (24.05 mmol/l in 1 g of dry weight) in comparison with control lambs (21.47 mmol/l in I g of dry weight). In the Romney Marsh lambs, the application of Vitazol AD₃E resulted in higher (P≤0.05) calcium concentration (23 .46 mmol/l in 1 g of dry weight) and higher (P≤0.05) ratio of Ca to P ( 1.59: 1) in bone tissue compared with the control lambs (respectively 19.96 mmol/l in 1 g of dry weight and 1.17: 1).