Effect of feeding on the fatty acid composition of different fatty tissues of Hungarian Grey and Holstein Friesian bulls. II. super(1)H-Nuclear Magnetic Resonance (NMR) investigations [in German]

In this attempt the relaxation times using super(1)H-NMR spectroscopy from three different (subcutaneous, perinephric and internal fat) fat depots of Hungarian Grey and Holstein Friesian extensive or intensive fattened young bulls were measured. The relaxation properties were compared with the analysis of fatty acid compostion. The different diets and the sample location have a higher influence on the relaxation times than the breed. In fat samples from extensive groups the T sub(1)-relaxation time was longer, while the T sub(2)-relaxation time was significantly shorter in intensive fed groups. The T sub(2)-relaxation time, as well as the relaxation time of T sub(21)- und T sub(22)-components were the shortest in extensive fed animals, while the proportion of T sub(21)-component was the highest in kidney fat, furthermore the difference was statistics proved. The T sub(2)-relaxation time showed a close negative relationship with the ratio of saturated fatty acids (SFA). The ratio of v sub(21) and v sub(22) depends on chemical composition of fat samples. In fat tissues with a high SFA percentage caused a higher proportion of v sub(21). It is suggested that differences in fatty acid compositon of fat samples caused also alteration in the relaxation time.