Crossbred ram-lambs (50% Booroola and 50% Olkuska Sheep) aged 55 days were assigned to
control (C, n=8) and experimental (E, n=9) group with mean live body weight of 16.0 and 15.3 kg,
respectively. Lambs of both groups were fed ad lib. the pelleted mixed concentrate containing 231
g crude protein (CP) and 12 MJ metabolizable energy (ME) per kg dry matter. During fattening
each lamb from group E was administered per os 3 g of linseed with 3 g mineral bioplex daily.
C and E lambs were slaughtered on day 141 of life at the mean live weight of 36.3 and 34.3 kg,
respectively. Significant differences between groups were observed neither in the mean daily live
weight gain (group C – 238 g vs. group E – 225 g) nor in CP and ME intake per kg live weight gain
(group C – 890 g and 46.1 MJ vs. group E – 938 g and 48.6 MJ, respectively). The levels of blood
plasma cholesterol and its fractions were not found to be significantly differentiated by groups.
Dressing percentage, share of valuable cuts in carcass-side and perirenal fat content confirmed
the similar slaughter value of C and E lambs (47.39%, 42.65%, 1.74% vs. 48.22%, 42.36%, 1.95%,
respectively). The dietetic value of meat, based on the fatty acid profile of intramuscular fat, was
generally more favourable in lambs fattened with supplement because of the higher percentage of
unsaturated fatty acids (UFA) and lower of saturated fatty acids (SFA).