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Gewählte Master / Diploma Thesis:

Julia Maria Keplinger (2017): Detection of silage feeding by fatty acid profile analysis in consumer milk.
Master / Diploma Thesis - Institut für Lebensmittelwissenschaften, BOKU-Universität für Bodenkultur, pp 151. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Abstract:
There is growing demand for high-quality dairy products. Dairy production systems vary in the way of feeding and livestock-keeping regimen. They are on the one hand quality parameters and on the other hand important topics for consumer perceptions. Animal feed represents one of the major impacts on the fatty acid (FA) profile in consumer milk. In respect to this, the aim of the present thesis was the research on analytical differentiation of consumers’ cow milk according to their feeding system of origin by FA spectra. Simultaneously, this study compares the FA pattern of retail consumer milk (n=84) from different feeding systems. Forty-five samples of non-silage milk, declared as hay milk and 39 samples of conventional CON (silage) were analysed across seasons in 2015. The emphasis of this comparison was on the minor, long-chain polyunsaturated FAs. Additionally, a differentiation of seasons (4 quarters=Q1-Q4) was done to see if and how they affect the cows feed and the resulting milk FAs. A distinctive differentiation and identification of FAMEs was possible with previous concentration steps, gas chromatography (GC) together with mass spectrometry (MS) and a flame ionisation detector (FID). A seasonal difference between winter and summer feeding is evident in both groups. In HAY-milk the values of each FA are always higher compared to the conventional samples, during summer months. The polyunsaturated FAs as well as the omega-3 FA concentrations are higher in HAY than in conventionally produced milk, especially during summer.

Beurteilende(r): Schreiner Matthias

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