SPECIAL MEAT QUALITY PARAMETERS OF LAMBS OF DIFFERENT GENOTYPES UNDERECOLOGICAL MANAGEMENT CONDITIONS

The purpose of this study is to investigate the meat quality (area of muscles longissimus dorsi, intramusculare fat colour of muscles and fa tty acid composition) of different genotypes of lambs. which had been fed in the last six weeks before slaughter differently. All lambs were allowed to graze with their dams. In the last six weeks before they w ere slaughtered. lambs were separated into two feeding groups [Feeding group I and Feeding group rrl. Feeding group I was kept on the grassl and until slaughter, whereas the Feeding group II was supplemented wit h concentrate feeding in the last 6 weeks. Data were collected from th e following 5 different genotypes of male lambs: (Merinolandschaf Sco ttish Blackface) Hampshire, Merinolandschaf * Cheviot, Merinolandscha f Schwarzkopfiges Fleischschaf, Mermolandschaf * Suffolk and Merinol andschaf Texelschaf. The results obtained indicate that the gratings on rangeland with low-quality forages would not allow to reach the opt imal growth of muscles of fattening lambs. From the obtained results c ould be concluded that grazing of fattening lambs on the rangeland nei ther without concentrate feeding nor with short time supplementation o f concentrate Cin this cases six weeks) allowed to reach the optimal g rowth of muscles. There are slight differences tin most cases signific ant with p < 0.05) among crosses in the colour of M. long. dorsi. Lamb s only fed on grass indicated a higher concentration of Omega 3-fatty acid in comparison to lambs supplemented with concentrates, which had more Omega 6-fatty acid. The differences were caused by the variation of the feeding system. The ratio of saturated fatty acids to polyunsat urated acids was not different between crosses.