Factors affecting fatty acid composition in forage and milk

Open AccessDissertation

Factors affecting fatty acid composition in forage and milk

Katarina Arvidsson Segerkvist-2009-01-01-Epsilon Open Archive (Sveriges lantbruksuniversitet biblioteket (Swedish University of Agricultural Sciences))

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The aims of the studies underlying this thesis were to evaluate variations in fatty acid (FA) contents of plants used as forage for dairy cows in northern Sweden, and their effects on the FA contents of the milk. Initially, samples of timothy (Phleum pratense L.) were subjected to different pre-treatments prior to analysis. Freezing with liquid N was not necessary to obtain apparently reliable FA profiles of the samples examined. The prevailing method for handling samples before analysis, i.e. freeze-drying and grinding, was satisfactory. However, heat drying samples at 60°C was just as good, or even better in some cases. Neither wilting (to 330-350 g dry matter/kg) nor application of additives (acid additive or bacterial inoculant) to timothy had any substantial effects on the proportions of FAs in silage. In addition, seasonal variations in FA concentrations were evaluated in timothy and meadow fescue (Festuca pratensis Huds.) subjected to three different N fertilization regimes and

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The aims of the studies underlying this thesis were to evaluate variations in fatty acid (FA) contents of plants used as forage for dairy cows in northern Sweden, and their effects on the FA contents of the milk. Initially, samples of timothy (Phleum pratense L.) were subjected to different pre-treatments prior to analysis. Freezing with liquid N was not necessary to obtain apparently reliable FA profiles of the samples examined. The prevailing method for handling samples before analysis, i.e. freeze-drying and grinding, was satisfactory. However, heat drying samples at 60°C was just as good, or even better in some cases. Neither wilting (to 330-350 g dry matter/kg) nor application of additives (acid additive or bacterial inoculant) to timothy had any substantial effects on the proportions of FAs in silage. In addition, seasonal variations in FA concentrations were evaluated in timothy and meadow fescue (Festuca pratensis Huds.) subjected to three different N fertilization regimes and

Keywords

PhleumForageSilageDry matterFestuca pratensisFatty acidAnimal scienceWilting

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