Effects of different amounts and types of fat on fatty acid composition of fat deposit in lambs Vliv různého množství a druhu tuku na složení mastných kyselin v depotním tuku u jehňat

Interest in the fatty acid composition of a product received from ruminants has increased in the last decade as a result of health benefits of some of them related to its consumption. In the present experiment the effect of three fat supplements on the fatty acid composition of subcutaneous and perirenal adipose tissues and in the muscles of lambs was measured. 24 fattened lambs (average BW = 22 ± 2 kg) were used during the experiment. The animals were divided into four groups and fed control (without fat addition) and experimental (6% of linseed oil, rapeseed oil or hydrogenated rapeseed oil in dry matter) diets. The results confirmed a significant ( P < 0.05 and P < 0.01) influence of diet and source of added fat on the fatty acid composition of products received from ruminants, mostly in muscles and subcutaneous fat. Addition of hydrogenated rapeseed oil increased the level of saturated fatty acids and as a consequence decreased the level of monounsaturated fatty acids in muscles and subcutaneous fat. Linseed oil increased the level of n-3 polyunsaturated fatty acids in muscles and in subcutaneous fat. Rapeseed oil did not change the fatty acid composition either in muscles or in subcutaneous fat. There was no influence of added fats on the fatty acid composition in perirenal fat.