Variability of milk fatty acid composition in Slovenia | Variabilnost mascobnokislinske sestave mleka v Sloveniji
2006
Lavrencic, A. | Levart, A. | Salobir, J.
In year 2005, 48 samples of bulk milk samples were collected on 16 farms and three dairies in Slovenia and their fatty acid composition was determined. The objectives of the research were to determine possible differences between three geographical regions (Eastern, Coastal and Central Slovenia), rearing regimes (organic and conventional with all dairies) and season (winter and summer). Results showed that milk samples collected in summer contained significantly lower proportion of saturated fatty acids (SFA, 64.2 % of all fatty acids, weight percents) and higher proportions of monounsaturated (MUFA, 26.0 %) and poliunsaturated fatty acids (PUFA, 5.0 %) than milk collected when animals received winter diet (70.1 % SFA, 30.8 % MUFA and 3.9 % PUFA). Milk from conventional farms contained significantly higher proportion of SFA (68.1 %) and lower proportions of MUFA (27.9 %) and PUFA (2.0 %) than milk collected from organic farms (65.1 % SFA, 29.2 % MUFA and 5.0 % PUFA). These differences became even greater in summer. Yearly average proportion of conjugated linoleic acid (CLA) in milk was 0.9 %. The greatest proportion of CLA was determined in the summer milk from organic farms (1.60 %), while the lowest proportion of CLA was determined in winter milk from conventional farms (0.55 %). We can conclude that fatty acid composition of milk is more favourable in summer. This is especially valid for milk deriving from organic farms, while in the winter there are no differences between fatty acid composition of milk deriving from organic and conventional farms. Geographical regions did not affected fatty acid composition of milk.
Показать больше [+] Меньше [-]Ключевые слова АГРОВОК
Библиографическая информация
Эту запись предоставил University of Ljubljana