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Kaufmann, L D; Dohme-Meier, F; Munger, A; Bruckmaier, R M; van Dorland H. A., (2012). Metabolism of grazed vs. zero-grazed dairy cows throughout the vegetation period: hepatic and blood plasma parameters. Journal of animal physiology and animal nutrition, 96(2), pp. 228-36. Berlin: Blackwell Science 10.1111/j.1439-0396.2011.01142.x