COMPOSITION OF FATTY ACIDS IN MILK FAT FROM MILK OBTAINED FROM COWS GROWN IN COWSHEDS IN SUMMER AND WINTER SEASON PERIODS
Journal Title: Żywność. Nauka. Technologia. Jakość - Year 2012, Vol 19, Issue 1
Abstract
The composition and quality of milk depend on various factors, among other things, on genetic and environmental conditions, physiological status of animals, and season of the year. The effect of season of the year is reflected by the seasonality of milk production (winter season: indoor feeding; summer season: pasture feeding). However, in recent years, the conditions of dairy farming have changed, i.e. cows are kept in cowsheds all year long and the pasture feeding has been replaced by a PMR feeding system. This could be linked with changes in milk composition, including changes in the profile of fatty acids. In order to verify this hypothesis, a research study has been undertaken and focused on the analysis of fat in milk from the summer and winter periods. The milk studied was provided by a large farm applying a PMR feeding system. The milk fat was extracted using a Röse-Gottlib method; the methyl esters of fatty acids in the fat extracted were prepared according to an IDF Standard method. The separation of methyl esters was performed by gas chromatography with the use of a gas chromatograph equipped with a flame ionization detector (FID). It was found that the fat from milk obtained in summer had more unsaturated fatty acids and the fat in milk from winter contained more saturated fatty acids. Those differences resulted from, primarily, the increased content of oleic, stearic, and polyunsaturated fatty acids, as well as from the decreased content of palmitic, myristic, and lauric acid in the summer period. Additionally, it was proved that despite the raising of cows in cowsheds, still, there were changes in the profile of fatty acids appearing characteristic for the summer and winter period.
Authors and Affiliations
Barbara Felkner-Późniakowska, Renata Pietrzak-Fiećko, Michalina Kotlarska, Sylwia Kacprzak
Keywords
Related Articles
- EP ID EP116263
- DOI 10.15193/zntj/2012/80/081-092
- Views 38
- Downloads 0
THE RELATIONSHIP BETWEEN CARCASS FATNESS AND INTRAMUSCULAR FAT CONTENT, AND FATTY ACIDS PROFILE IN PIG MEAT
The objective of the present study was to determine the relationship between carcass fatness and intramuscular fat content, and the profile of fatty acids in pig meat of Złotnicka Spotted breed and of crossbreed F1 (Po...
Ocena wartości odżywczej olejów roślinnych o dużej zawartości kwasów linolenowych na podstawie składu kwasów tłuszczowych, tokoferoli i steroli
Celem pracy była ocena wartości odżywczej olejów roślinnych, o dużej zawartości kwasów linolenowych, na podstawie składu kwasów tłuszczowych, tokoferoli i steroli. Badaniom poddano oleje roślinne: tłoczone na zimno – l...
EFFECT OF S-CARVONE APPLIED AS NATURAL INHIBITOR OF POTATO SPROUTS ON COLOUR BRIGHTNESS OF POTATO CHIPS
The objective of the research study was to determine the effect S-carvone applied as a natural sprout inhibitor on the colour brightness of chips. The research was carried out on two potato cultivars: ‘Asterix’ and ‘Gr...
Podstawowy skład chemiczny, zawartość mikro- i makroelementów oraz właściwości przeciwutleniające liści różnych odmian czosnku polskiego pochodzenia
COMPARING SELECTED BIOLOGICAL PROPERTIES OF GARLIC ( ALLIUM SATIVUM L.) FROM POLAND AND CHINA