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Doctor of Philosophy, (Animal Science)
Study Completed: 2017
College of Sciences
Differentiation between organic and conventionally produced milk in pasture based farming systems
Consumer perception of organic cows' milk is associated with the assumption that organic milk differs from conventionally produced milk, justifying premium prices. Ms Schwendel investigated whether chemical composition differed between milk produced by these two farming systems. Sampling was conducted on two farms sets, each comprising one organic and one conventional farm. All farms applied year-round pasture grazing. Milk samples were collected throughout the milking season and analysed for free oligosaccharides, fatty acids, major casein and whey proteins, milk fat volatiles, and a limited set of milk metabolites using nuclear magnetic resonance. Fatty acids were influenced by breed and fertiliser application. Oligosaccharides differed between farming systems, with causes currently unknown, while farm set was the dominant influence factor on protein composition. Those factors influencing milk chemical composition are not exclusive to either farming system, and pasture feeding conventional cows will remove differences previously reported for organic and conventionally produced milk.
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Last updated on Tuesday 04 April 2017